/* ================================================
   INSULATION CALCULATOR — International Wizard
   Light Blue Theme · 6 Steps
   ================================================ */

:root {
    --color-primary: #3A9BD5;
    --color-primary-light: #6DB9E8;
    --color-primary-lighter: #B8DDF5;
    --color-primary-lightest: #E8F4FC;
    --color-primary-dark: #2478A8;
    --color-accent: #F0960A;
    --color-accent-hover: #D9850A;
    --color-success: #22A559;
    --color-success-light: #E6F7ED;
    --color-white: #FFFFFF;
    --color-bg: #F4F9FD;
    --color-bg-card: #FFFFFF;
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-border: #CBD5E1;
    --color-border-light: #E2E8F0;
    --color-step-active: #3A9BD5;
    --color-step-completed: #22A559;
    --color-step-inactive: #CBD5E1;
    --shadow-sm: 0 1px 3px rgba(58, 155, 213, .08);
    --shadow-md: 0 4px 14px rgba(58, 155, 213, .10);
    --shadow-lg: 0 8px 30px rgba(58, 155, 213, .14);
    --shadow-card: 0 2px 8px rgba(58, 155, 213, .07);
    --shadow-card-hover: 0 8px 25px rgba(58, 155, 213, .18);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --transition: .25s ease;
}

/* Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0
}

html {
    font-size: 16px;
    scroll-behavior: smooth
}

body {
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased
}

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1.5rem
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0
}

/* ── HEADER ── */
.header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    padding: 1.1rem 0;
    box-shadow: 0 4px 20px rgba(58, 155, 213, .25);
    position: relative;
    overflow: hidden
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .75rem
}

.site-title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.6rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -.02em
}

.site-logo {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    background: #B4DDF6;
    display: inline-block;
}

/* Unit Toggle */
.unit-toggle {
    display: flex;
    background: rgba(255, 255, 255, .15);
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, .25)
}

.unit-btn {
    padding: .45rem 1.1rem;
    font-family: var(--font);
    font-size: .8rem;
    font-weight: 600;
    color: rgba(255, 255, 255, .75);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition)
}

.unit-btn.active {
    background: #fff;
    color: var(--color-primary-dark);
    border-radius: var(--radius-full)
}

.unit-btn:hover:not(.active) {
    color: #fff
}

/* ── MAIN ── */
.main {
    padding: 2rem 0 3.5rem
}

/* ── STEPPER ── */
.stepper {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    margin-bottom: 2rem;
    padding: 1.2rem 1rem;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md)
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .35rem;
    min-width: 70px
}

.step-circle {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .8rem;
    font-weight: 700;
    background: var(--color-step-inactive);
    color: #94A3B8;
    transition: all var(--transition)
}

.step.active .step-circle {
    background: var(--color-step-active);
    color: #fff;
    box-shadow: 0 0 0 4px rgba(58, 155, 213, .2)
}

.step.completed .step-circle {
    background: var(--color-step-completed);
    color: #fff;
    font-size: 0
}

.step.completed .step-circle::after {
    content: '✓';
    font-size: .8rem;
    font-weight: 700
}

.step-label {
    font-size: .68rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-align: center;
    line-height: 1.2;
    transition: color var(--transition)
}

.step.active .step-label {
    color: var(--color-primary);
    font-weight: 600
}

.step.completed .step-label {
    color: var(--color-success);
    font-weight: 600
}

.step-line {
    flex: 1;
    height: 2px;
    background: var(--color-border-light);
    margin-top: 17px;
    min-width: 16px;
    transition: background var(--transition)
}

.step-line.completed {
    background: var(--color-step-completed)
}

/* ── STEP CONTENT ── */
.step-content {
    display: none;
    text-align: center;
    animation: fadeIn .35s ease
}

.step-content.active {
    display: block
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(14px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.question-title {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: .75rem
}

.question-description {
    font-size: .95rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto 1.75rem;
    line-height: 1.65
}

/* ── STEP 1: COUNTRY CARDS ── */
.country-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 540px;
    margin: 0 auto 2rem
}

.country-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    padding: 1.25rem .75rem;
    background: #fff;
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
    color: var(--color-text);
    outline: none;
    position: relative;
    overflow: hidden
}

.country-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-lightest), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition)
}

.country-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-3px)
}

.country-card:hover::before {
    opacity: 1
}

.country-card.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-lightest);
    box-shadow: 0 0 0 3px rgba(58, 155, 213, .15)
}

.country-card.selected::after {
    content: '✓';
    position: absolute;
    top: 6px;
    right: 8px;
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: popIn .3s cubic-bezier(.34, 1.56, .64, 1)
}

.country-flag {
    font-size: 2.2rem;
    position: relative;
    z-index: 1
}

.country-name {
    font-size: .82rem;
    font-weight: 600;
    position: relative;
    z-index: 1
}

@keyframes popIn {
    from {
        transform: scale(0)
    }

    to {
        transform: scale(1)
    }
}

/* ── STEP 2: TYPE CARDS ── */
.type-grid {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 2rem
}

.type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .75rem;
    padding: 1.5rem 2rem;
    background: #fff;
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
    color: var(--color-text);
    outline: none;
    min-width: 155px;
    position: relative;
    overflow: hidden
}

.type-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-lightest), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition)
}

.type-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-4px)
}

.type-card:hover::before {
    opacity: 1
}

.type-card.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-lightest);
    box-shadow: 0 0 0 3px rgba(58, 155, 213, .15)
}

.type-card.selected::after {
    content: '✓';
    position: absolute;
    top: 8px;
    right: 10px;
    width: 22px;
    height: 22px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: popIn .3s cubic-bezier(.34, 1.56, .64, 1)
}

.type-icon {
    width: 90px;
    height: 75px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1
}

.type-icon svg {
    width: 100%;
    height: 100%;
    transition: transform var(--transition)
}

.type-card:hover .type-icon svg {
    transform: scale(1.08)
}

.type-label {
    font-size: 1rem;
    font-weight: 600;
    position: relative;
    z-index: 1
}

/* ── STEP 3: AREA ── */
.area-mode-toggle {
    display: flex;
    justify-content: center;
    margin-bottom: 1.75rem;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    padding: 4px;
    max-width: 360px;
    margin-left: auto;
    margin-right: auto
}

.mode-btn {
    flex: 1;
    padding: .6rem 1rem;
    font-family: var(--font);
    font-size: .82rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition)
}

.mode-btn.active {
    background: #fff;
    color: var(--color-primary-dark);
    box-shadow: var(--shadow-sm)
}

.area-panel {
    display: none
}

.area-panel.active {
    display: block
}

.dim-inputs {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem
}

.dim-group {
    display: flex;
    flex-direction: column;
    gap: .35rem;
    align-items: center
}

.dim-group label {
    font-size: .75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: .04em
}

.input-with-unit {
    position: relative;
    display: flex;
    align-items: center
}

.dim-input {
    width: 110px;
    padding: 12px 14px;
    padding-right: 38px;
    font-family: var(--font);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all .15s ease;
    outline: none;
    -webkit-appearance: textfield;
    -moz-appearance: textfield;
    appearance: textfield;
}

.dim-input::-webkit-inner-spin-button,
.dim-input::-webkit-outer-spin-button {
    opacity: 1
}

.dim-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(58, 155, 213, .15)
}

.dim-unit {
    position: absolute;
    right: 10px;
    font-size: .75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    pointer-events: none
}

.dim-x,
.dim-equals {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text-secondary);
    padding-bottom: 6px
}

.result-group .calc-area {
    padding: 12px 18px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    background: var(--color-primary-lightest);
    border: 2px solid var(--color-primary-lighter);
    border-radius: var(--radius-md);
    min-width: 130px;
    text-align: center
}

.large-input {
    width: 160px;
    font-size: 1.3rem
}

.direct-input-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    margin-bottom: 1.5rem
}

.direct-input-wrapper label {
    font-size: .8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: .04em
}

/* ── STEP 4: SPACING ── */
.spacing-options {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .75rem;
    margin-bottom: 1.5rem
}

.spacing-btn {
    padding: .85rem 1.5rem;
    font-family: var(--font);
    font-size: .95rem;
    font-weight: 600;
    color: var(--color-text);
    background: #fff;
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    min-width: 180px;
    text-align: center
}

.spacing-btn:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-card)
}

.spacing-btn.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-lightest);
    color: var(--color-primary-dark)
}

.spacing-btn[data-spacing="custom"] {
    color: var(--color-text-secondary);
    border-style: dashed
}

.spacing-btn[data-spacing="custom"].selected {
    border-style: solid
}

.custom-spacing-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .4rem;
    margin-bottom: 1.5rem
}

.custom-spacing-wrapper label {
    font-size: .8rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: .04em
}

/* ── SPACING BUTTON SUBTITLE ── */
.spacing-sub {
    display: block;
    font-size: .72rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-top: 2px
}

.spacing-btn.selected .spacing-sub {
    color: var(--color-primary)
}

/* ── WASTE FACTOR ── */
.waste-factor-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    margin-top: 1.25rem;
    margin-bottom: .5rem
}

.waste-factor-row label {
    font-size: .82rem;
    font-weight: 600;
    color: var(--color-text-secondary)
}

.waste-select {
    padding: 8px 14px;
    font-family: var(--font);
    font-size: .85rem;
    font-weight: 600;
    color: var(--color-text);
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition)
}

.waste-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(58, 155, 213, .15)
}

/* ── STEP 5: R-VALUE ── */
.rvalue-info-bar {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
    font-size: .78rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    flex-wrap: wrap
}

.rvalue-system-label {
    color: var(--color-primary)
}

.rvalue-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: .75rem;
    max-width: 600px;
    margin: 0 auto 2rem
}

.rvalue-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .2rem;
    padding: 1rem;
    font-family: var(--font);
    background: #fff;
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    outline: none
}

.rvalue-btn:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-card)
}

.rvalue-btn.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-lightest)
}

.rvalue-primary {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text)
}

.rvalue-secondary {
    font-size: .75rem;
    font-weight: 500;
    color: var(--color-text-secondary)
}

.rvalue-btn.selected .rvalue-primary {
    color: var(--color-primary-dark)
}

/* ── STEP 6: RESULTS ── */
.results-card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: left;
    border: 1px solid var(--color-border-light)
}

.results-summary {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border-light)
}

.results-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0
}

.results-icon svg {
    width: 100%;
    height: 100%
}

.results-heading {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text)
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .85rem;
    margin-bottom: 1.5rem
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: .15rem;
    padding: 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light)
}

.result-item.highlight {
    background: var(--color-primary-lightest);
    border-color: var(--color-primary-lighter)
}

.result-item.full-width {
    grid-column: 1 / -1
}

.result-label {
    font-size: .7rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: .04em
}

.result-value {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text)
}

.result-value.big {
    font-size: 1.6rem;
    color: var(--color-primary-dark)
}

.result-sub {
    font-size: .78rem;
    font-weight: 500;
    color: var(--color-text-secondary)
}

.result-item.highlight .result-value {
    color: var(--color-primary-dark)
}

.results-note {
    display: flex;
    align-items: flex-start;
    gap: .5rem;
    padding: .85rem;
    background: var(--color-primary-lightest);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-primary)
}

.results-note svg {
    flex-shrink: 0;
    margin-top: 2px
}

.results-note span {
    font-size: .8rem;
    color: var(--color-text-secondary);
    line-height: 1.5
}

/* ── BUTTONS ── */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: .85rem;
    margin-top: 1.75rem
}

.btn-next {
    padding: 13px 44px;
    font-family: var(--font);
    font-size: .95rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(240, 150, 10, .35);
    transition: all var(--transition);
    position: relative;
    overflow: hidden
}

.btn-next::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .2), transparent);
    transition: left .5s ease
}

.btn-next:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(240, 150, 10, .45)
}

.btn-next:hover::before {
    left: 100%
}

.btn-next:active {
    transform: translateY(0)
}

.btn-back {
    padding: 13px 32px;
    font-family: var(--font);
    font-size: .95rem;
    font-weight: 600;
    color: var(--color-text);
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition)
}

.btn-back:hover {
    background: var(--color-bg);
    border-color: var(--color-text-secondary)
}

/* ── HELPERS ── */
@keyframes shake {

    0%,
    100% {
        transform: translateX(0)
    }

    20% {
        transform: translateX(-6px)
    }

    40% {
        transform: translateX(6px)
    }

    60% {
        transform: translateX(-4px)
    }

    80% {
        transform: translateX(4px)
    }
}

/* ── HEADER NAVIGATION ── */
.header-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: all var(--transition);
    position: relative;
}

.nav-link:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
}

.nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
}

/* ── BLOG HERO ── */
.blog-hero {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    padding: 3rem 0 3.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.blog-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.07) 0%, transparent 70%);
    border-radius: 50%;
}

.blog-hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.blog-hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.blog-hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.65;
    position: relative;
    z-index: 1;
}

/* ── BLOG MAIN ── */
.blog-main {
    padding: 3rem 0 4rem;
}

/* ── BLOG GRID ── */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

/* ── BLOG CARD ── */
.blog-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
    transition: all 0.35s ease;
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-lighter);
}

.blog-card-image-link {
    display: block;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.blog-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.blog-card:hover .blog-card-image {
    transform: scale(1.06);
}

.blog-card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.blog-card-date {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.blog-card-category {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-primary-lightest);
    padding: 0.2rem 0.65rem;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.blog-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.blog-card-title a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition);
}

.blog-card-title a:hover {
    color: var(--color-primary);
}

.blog-card-excerpt {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 1.25rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-readmore {
    display: inline-flex;
    align-items: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    transition: all var(--transition);
    align-self: flex-start;
}

.blog-card-readmore:hover {
    color: var(--color-primary-dark);
    gap: 0.3rem;
}

/* ── HOME BLOG SECTION ── */
.home-blog-section {
    padding: 4rem 0 3rem;
    background: var(--color-bg);
}

.home-blog-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.home-blog-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.home-blog-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.6;
}

.blog-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.home-blog-cta {
    text-align: center;
    margin-top: 2.5rem;
}

.btn-view-all {
    display: inline-block;
    padding: 0.85rem 2.5rem;
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-primary-lightest);
    border: 2px solid var(--color-primary-lighter);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: all var(--transition);
}

.btn-view-all:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(58, 155, 213, 0.3);
}

/* ── BLOG ARTICLE PAGE ── */
.blog-article {
    max-width: 780px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.blog-article-header {
    margin-bottom: 2rem;
}

.blog-article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.blog-article-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-text);
    line-height: 1.3;
    letter-spacing: -.02em;
    margin-bottom: 1rem;
}

.blog-article-featured {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.blog-article-featured img {
    width: 100%;
    height: auto;
    display: block;
}

.blog-article-body {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text);
}

.blog-article-body h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin: 2.5rem 0 1rem;
    color: var(--color-text);
}

.blog-article-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 2rem 0 .75rem;
    color: var(--color-text);
}

.blog-article-body p {
    margin-bottom: 1.25rem;
    color: var(--color-text-secondary);
}

.blog-article-body ul,
.blog-article-body ol {
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
}

.blog-article-body li {
    margin-bottom: .5rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.blog-article-body strong {
    color: var(--color-text);
    font-weight: 600;
}

.blog-article-body blockquote {
    border-left: 4px solid var(--color-primary);
    background: var(--color-primary-lightest);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.blog-article-body a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-article-body a:hover {
    color: var(--color-primary-dark);
}

.blog-article-cta {
    background: linear-gradient(135deg, var(--color-primary-lightest), #fff);
    border: 2px solid var(--color-primary-lighter);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    margin: 2.5rem 0;
}

.blog-article-cta h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: .5rem;
}

.blog-article-cta p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.blog-article-cta .btn-cta {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    padding: .75rem 2rem;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: .95rem;
    transition: all var(--transition);
}

.blog-article-cta .btn-cta:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(58, 155, 213, .3);
}

.blog-back-link {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: .9rem;
    margin-bottom: 1.5rem;
    transition: color var(--transition);
}

.blog-back-link:hover {
    color: var(--color-primary-dark);
}

@media (max-width: 600px) {
    .blog-article-title {
        font-size: 1.6rem;
    }

    .blog-article-body {
        font-size: .95rem;
    }
}

/* ── SEO CONTENT SECTION ── */
.seo-content {
    background-color: transparent;
    padding: 3rem 1.5rem 4rem;
}

.seo-container {
    max-width: 1000px;
    margin: 0 auto;
    color: var(--color-text);
    font-family: var(--font);
    line-height: 1.7;
}

.seo-container h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    margin: 3.5rem 0 1.5rem;
    border-bottom: 2px solid var(--color-primary-lightest);
    padding-bottom: 0.5rem;
}

.seo-container h2:first-child {
    margin-top: 0;
}

.seo-container h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 2.5rem 0 1rem;
}

.seo-container h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 1.5rem 0 0.75rem;
}

.seo-container p {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    margin-bottom: 1.25rem;
}

.seo-container ul,
.seo-container ol {
    margin: 0 0 1.5rem 1.75rem;
    color: var(--color-text-secondary);
    font-size: 1.05rem;
}

.seo-container li {
    margin-bottom: 0.6rem;
}

.seo-container strong {
    color: var(--color-text);
    font-weight: 600;
}

.seo-container .keyword {
    font-weight: inherit;
    color: inherit;
}

/* Keeps natural styling for keywords to avoid stuffing appearance */

.concept-block {
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.concept-block strong {
    display: block;
    font-size: 1.15rem;
    color: var(--color-primary-dark);
    margin-bottom: 0.5rem;
}

.concept-block p {
    margin-bottom: 0;
}

.faq-item {
    margin-bottom: 2rem;
}

.faq-item h3 {
    font-size: 1.2rem;
    margin: 0 0 0.5rem;
    color: var(--color-primary-dark);
}

.faq-item p {
    margin-bottom: 0;
}

/* ── FOOTER ── */
.footer {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #E8F4FC;
    padding: 3.5rem 0 0;
    font-size: .85rem;
    margin-top: 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.5fr;
    gap: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.brand-col {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.footer-logo .site-logo {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: #B4DDF6;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: #FFFFFF;
    letter-spacing: -.02em;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.6;
    max-width: 300px;
}

.footer-heading {
    font-size: .75rem;
    font-weight: 700;
    color: #FFFFFF;
    text-transform: uppercase;
    letter-spacing: .08em;
    margin-bottom: 1.25rem;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: .8rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: color var(--transition);
    font-weight: 500;
}

.footer-links a:hover {
    color: #FFFFFF;
}

.lang-grid {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}

.lang-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: .75rem;
    font-weight: 600;
    transition: all var(--transition);
}

.lang-btn:hover {
    border-color: #FFFFFF;
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.1);
}

.lang-btn.active {
    border-color: #FFFFFF;
    color: var(--color-primary-dark);
    background: #FFFFFF;
}

.footer-bottom {
    padding: 1.5rem 0;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: .8rem;
}

/* ── RESPONSIVE ── */
@media(max-width:768px) {
    .header .container {
        justify-content: center;
        text-align: center
    }

    .site-title {
        font-size: 1.3rem;
        width: 100%
    }

    .header-nav {
        width: 100%;
        justify-content: center;
        gap: 0.15rem;
    }

    .nav-link {
        font-size: 0.78rem;
        padding: 0.4rem 0.7rem;
    }

    .stepper {
        padding: .9rem .5rem;
        overflow-x: auto;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch
    }

    .step {
        min-width: 58px
    }

    .step-circle {
        width: 28px;
        height: 28px;
        font-size: .7rem
    }

    .step-label {
        font-size: .6rem
    }

    .step-line {
        margin-top: 14px;
        min-width: 10px
    }

    .question-title {
        font-size: 1.35rem
    }

    .country-grid {
        grid-template-columns: repeat(2, 1fr)
    }

    .type-grid {
        gap: .75rem
    }

    .type-card {
        min-width: 130px;
        padding: 1.2rem 1.2rem
    }

    .type-icon {
        width: 70px;
        height: 60px
    }

    .dim-inputs {
        gap: .6rem
    }

    .dim-input {
        width: 90px;
        padding: 10px 12px;
        font-size: 1rem
    }

    .large-input {
        width: 130px
    }

    .results-grid {
        grid-template-columns: 1fr
    }

    .results-card {
        padding: 1.25rem
    }

    .rvalue-options {
        grid-template-columns: repeat(2, 1fr)
    }

    .blog-hero-title {
        font-size: 1.8rem;
    }

    .blog-hero-subtitle {
        font-size: 0.95rem;
    }

    .blog-grid,
    .blog-grid-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-desc {
        max-width: 100%;
    }
}

@media(max-width:480px) {
    .country-grid {
        grid-template-columns: 1fr 1fr
    }

    .dim-inputs {
        flex-direction: column;
        align-items: center
    }

    .dim-x,
    .dim-equals {
        padding: 0
    }

    .action-buttons {
        flex-direction: column;
        align-items: center
    }

    .btn-next,
    .btn-back {
        width: 100%;
        max-width: 240px
    }

    .spacing-options {
        flex-direction: column;
        align-items: center
    }

    .spacing-btn {
        width: 100%;
        max-width: 200px
    }
}

/* ── TOOLS SECTION ── */
.tools-section {
    padding: 4rem 0 3rem;
    background: linear-gradient(180deg, var(--color-bg) 0%, #fff 100%);
}

.tools-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.tools-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: .6rem;
    letter-spacing: -.02em;
}

.tools-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.tools-category {
    margin-bottom: 2rem;
}

.tools-category-title {
    display: flex;
    align-items: center;
    gap: .5rem;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 1rem;
    padding-bottom: .5rem;
    border-bottom: 2px solid var(--color-border-light);
}

.tools-category-icon {
    font-size: 1.3rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: .75rem;
}

.tool-card {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .85rem 1rem;
    background: #fff;
    border: 1.5px solid var(--color-border-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-lightest), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition);
}

.tool-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card:hover .tool-name {
    color: var(--color-primary-dark);
}

.tool-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
    width: 32px;
    text-align: center;
}

.tool-name {
    font-size: .82rem;
    font-weight: 600;
    line-height: 1.3;
    position: relative;
    z-index: 1;
    transition: color var(--transition);
}

/* Tools responsive */
@media (max-width: 600px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }

    .tools-title {
        font-size: 1.5rem;
    }

    .tools-subtitle {
        font-size: .9rem;
    }
}