/* ============================================
   vibe2lead.diy — Styles
   GOV.UK meets Money Saving Expert
   ============================================ */

/* ---- CSS Custom Properties ---- */
:root {
    /* Colours */
    --color-bg: #FAFAFA;
    --color-bg-white: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-secondary: #505A5F;
    --color-accent: #0B7285;
    --color-accent-dark: #095c6a;
    --color-accent-light: rgba(11, 114, 133, 0.1);
    --color-border: #E5E5E5;
    --color-paper: #FBF9F6;
    --color-paper-shadow: rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 4rem;

    /* Layout */
    --max-width: 680px;
    --nav-height: 50px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ---- Reset & Base ---- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
    font-family: var(--font-sans);
    font-weight: 600;
    line-height: 1.25;
    margin-top: 0;
}

h1 {
    font-size: 2.25rem;
}

h2 {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 1.375rem;
    margin-bottom: var(--space-sm);
}

h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    margin-top: var(--space-md);
}

p {
    margin-top: 0;
    margin-bottom: var(--space-sm);
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-dark);
}

a:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

strong {
    font-weight: 600;
}

ul {
    margin: var(--space-sm) 0;
    padding-left: var(--space-md);
}

li {
    margin-bottom: var(--space-xs);
}

/* ---- Skip Link ---- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-accent);
    color: white;
    text-decoration: none;
    z-index: 1000;
    border-radius: 0 0 4px 4px;
}

.skip-link:focus {
    top: 0;
    outline: none;
}

/* ---- Sticky Navigation ---- */
.sticky-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--color-bg-white);
    box-shadow: 0 1px 3px var(--color-paper-shadow);
    z-index: 100;
    transform: translateY(-100%);
    transition: transform var(--transition-normal);
}

.sticky-nav.visible {
    transform: translateY(0);
}

.nav-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-text);
    text-decoration: none;
}

.nav-logo:hover {
    color: var(--color-accent);
}

.step-indicators {
    display: flex;
    gap: var(--space-xs);
}

.step-link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.step-link:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.step-link.active {
    background: var(--color-accent);
    color: white;
}

/* ---- Hero Section ---- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl) var(--space-md);
    padding-top: calc(var(--space-xl) + var(--space-lg));
}

.hero-content {
    max-width: 900px;
    width: 100%;
}

/* ---- Book Animation ---- */
.book-container {
    perspective: 1500px;
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-xl);
}

.book {
    position: relative;
    width: 280px;
    height: 360px;
    transform-style: preserve-3d;
}

.book-cover {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    animation: openBook 15s ease-in-out forwards;
    animation-delay: 0.5s;
}

.book-spine {
    position: absolute;
    left: 0;
    width: 30px;
    height: 100%;
    background: linear-gradient(to right, #4a5568 0%, #2d3748 100%);
    transform: rotateY(-90deg) translateX(-15px);
    transform-origin: right;
    border-radius: 3px 0 0 3px;
}

.book-front {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    border-radius: 0 6px 6px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-lg);
    text-align: center;
    backface-visibility: hidden;
    box-shadow:
        2px 2px 8px rgba(0, 0, 0, 0.2),
        inset -2px 0 4px rgba(0, 0, 0, 0.1);
}

.book-title {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-paper);
    margin: 0;
    line-height: 1.3;
}

.book-subtitle {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-style: italic;
    color: rgba(251, 249, 246, 0.8);
    margin: var(--space-xs) 0 0 0;
}

.book-pages {
    position: absolute;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.page {
    position: absolute;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    top: 5px;
    left: 5px;
    background: var(--color-paper);
    border-radius: 0 4px 4px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-lg);
    text-align: center;
    backface-visibility: hidden;
    transform-origin: left;
    opacity: 0;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.03);
}

.page-number {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.page-content {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--color-text);
    margin: 0;
    line-height: 1.4;
}

/* Book animation keyframes - 15s total for weighty feel */
@keyframes openBook {
    0% {
        transform: rotateY(0deg);
    }
    10% {
        transform: rotateY(-160deg);
    }
    100% {
        transform: rotateY(-160deg);
    }
}

/* Filler pages - quick flips to simulate thick book */
.filler-page {
    position: absolute;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    top: 5px;
    left: 5px;
    background: linear-gradient(to right, var(--color-paper) 0%, #f5f3f0 100%);
    border-radius: 0 4px 4px 0;
    backface-visibility: hidden;
    transform-origin: left;
    opacity: 0;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.02);
}

/* Main content pages */
.page-1 { animation: flipPage1 15s ease-in-out forwards; animation-delay: 0.5s; }
.page-2 { animation: flipPage2 15s ease-in-out forwards; animation-delay: 0.5s; }
.page-3 { animation: flipPage3 15s ease-in-out forwards; animation-delay: 0.5s; }
.page-4 { animation: flipPage4 15s ease-in-out forwards; animation-delay: 0.5s; }
.page-5 { animation: flipPage5 15s ease-in-out forwards; animation-delay: 0.5s; }

/* Filler page animations - rapid flips between steps */
.filler-1a { animation: flipFiller1a 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-1b { animation: flipFiller1b 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-1c { animation: flipFiller1c 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-2a { animation: flipFiller2a 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-2b { animation: flipFiller2b 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-2c { animation: flipFiller2c 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-3a { animation: flipFiller3a 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-3b { animation: flipFiller3b 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-3c { animation: flipFiller3c 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-4a { animation: flipFiller4a 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-4b { animation: flipFiller4b 15s ease-in-out forwards; animation-delay: 0.5s; }
.filler-4c { animation: flipFiller4c 15s ease-in-out forwards; animation-delay: 0.5s; }

/* Step 1: shows at 10%, flips at 20% */
@keyframes flipPage1 {
    0%, 9% { opacity: 0; transform: rotateY(0deg); }
    10%, 19% { opacity: 1; transform: rotateY(0deg); }
    20%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Filler pages between step 1 and 2 */
@keyframes flipFiller1a {
    0%, 20% { opacity: 0; transform: rotateY(0deg); }
    21%, 22% { opacity: 1; transform: rotateY(0deg); }
    23%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller1b {
    0%, 23% { opacity: 0; transform: rotateY(0deg); }
    24%, 25% { opacity: 1; transform: rotateY(0deg); }
    26%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller1c {
    0%, 26% { opacity: 0; transform: rotateY(0deg); }
    27%, 28% { opacity: 1; transform: rotateY(0deg); }
    29%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Step 2: shows at 30%, flips at 40% */
@keyframes flipPage2 {
    0%, 29% { opacity: 0; transform: rotateY(0deg); }
    30%, 39% { opacity: 1; transform: rotateY(0deg); }
    40%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Filler pages between step 2 and 3 */
@keyframes flipFiller2a {
    0%, 40% { opacity: 0; transform: rotateY(0deg); }
    41%, 42% { opacity: 1; transform: rotateY(0deg); }
    43%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller2b {
    0%, 43% { opacity: 0; transform: rotateY(0deg); }
    44%, 45% { opacity: 1; transform: rotateY(0deg); }
    46%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller2c {
    0%, 46% { opacity: 0; transform: rotateY(0deg); }
    47%, 48% { opacity: 1; transform: rotateY(0deg); }
    49%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Step 3: shows at 50%, flips at 60% */
@keyframes flipPage3 {
    0%, 49% { opacity: 0; transform: rotateY(0deg); }
    50%, 59% { opacity: 1; transform: rotateY(0deg); }
    60%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Filler pages between step 3 and 4 */
@keyframes flipFiller3a {
    0%, 60% { opacity: 0; transform: rotateY(0deg); }
    61%, 62% { opacity: 1; transform: rotateY(0deg); }
    63%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller3b {
    0%, 63% { opacity: 0; transform: rotateY(0deg); }
    64%, 65% { opacity: 1; transform: rotateY(0deg); }
    66%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller3c {
    0%, 66% { opacity: 0; transform: rotateY(0deg); }
    67%, 68% { opacity: 1; transform: rotateY(0deg); }
    69%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Step 4: shows at 70%, flips at 80% */
@keyframes flipPage4 {
    0%, 69% { opacity: 0; transform: rotateY(0deg); }
    70%, 79% { opacity: 1; transform: rotateY(0deg); }
    80%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Filler pages between step 4 and 5 */
@keyframes flipFiller4a {
    0%, 80% { opacity: 0; transform: rotateY(0deg); }
    81%, 82% { opacity: 1; transform: rotateY(0deg); }
    83%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller4b {
    0%, 83% { opacity: 0; transform: rotateY(0deg); }
    84%, 85% { opacity: 1; transform: rotateY(0deg); }
    86%, 100% { opacity: 0; transform: rotateY(-180deg); }
}
@keyframes flipFiller4c {
    0%, 86% { opacity: 0; transform: rotateY(0deg); }
    87%, 88% { opacity: 1; transform: rotateY(0deg); }
    89%, 100% { opacity: 0; transform: rotateY(-180deg); }
}

/* Step 5: shows at 90%, stays visible */
@keyframes flipPage5 {
    0%, 89% { opacity: 0; transform: rotateY(0deg); }
    90%, 100% { opacity: 1; transform: rotateY(0deg); }
}

/* Reduced motion: show static book */
@media (prefers-reduced-motion: reduce) {
    .book-cover {
        animation: none;
        transform: rotateY(0deg);
    }

    .page {
        animation: none;
        opacity: 0;
    }

    .page-5 {
        opacity: 0;
    }
}

/* ---- Hero Blurb ---- */
.hero-blurb {
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero-headline {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.hero-emphasis {
    font-weight: 600;
    font-size: 1.25rem;
    margin-top: var(--space-lg);
}

/* ---- CTA Button ---- */
.cta-button {
    display: inline-block;
    margin-top: var(--space-lg);
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-accent);
    color: white;
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    transition: background var(--transition-fast);
}

.cta-button:hover {
    background: var(--color-accent-dark);
    color: white;
}

.cta-button:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}

/* ---- Step Sections ---- */
.step-section {
    padding: var(--space-xxl) var(--space-md);
    border-top: 1px solid var(--color-border);
}

.step-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.step-label {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

/* ---- Try This Box ---- */
.try-this {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-accent-light);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 4px 4px 0;
}

.try-this h3 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    color: var(--color-accent-dark);
}

.try-this p {
    margin: 0;
}

/* ---- Policy Alert ---- */
.policy-alert {
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: #FEF3C7;
    border-left: 4px solid #D97706;
    border-radius: 0 4px 4px 0;
    font-size: 0.9375rem;
}

.policy-alert strong {
    color: #92400E;
}

/* ---- Subsection ---- */
.subsection {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

/* ---- Audience Slider ---- */
.audience-slider {
    display: flex;
    position: relative;
    background: var(--color-bg);
    border-radius: 6px;
    padding: 4px;
    margin: var(--space-lg) 0;
    border: 1px solid var(--color-border);
}

.slider-option {
    flex: 1;
    padding: var(--space-sm) var(--space-xs);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    z-index: 1;
    transition: color var(--transition-fast);
}

.slider-option:hover {
    color: var(--color-text);
}

.slider-option.active {
    color: white;
}

.slider-option:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.slider-highlight {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(33.333% - 2.67px);
    height: calc(100% - 8px);
    background: var(--color-accent);
    border-radius: 4px;
    transition: transform var(--transition-normal);
    z-index: 0;
}

.slider-highlight[data-position="1"] {
    transform: translateX(0);
}

.slider-highlight[data-position="2"] {
    transform: translateX(100%);
}

.slider-highlight[data-position="3"] {
    transform: translateX(200%);
}

/* ---- Audience Content ---- */
.audience-content,
.audience-content-step5 {
    animation: fadeIn var(--transition-normal);
}

.audience-content.hidden,
.audience-content-step5.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---- Content Sections ---- */
.content-section {
    padding: var(--space-xxl) var(--space-md);
    border-top: 1px solid var(--color-border);
}

.section-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ---- Glossary ---- */
.glossary-section {
    background: var(--color-bg-white);
}

.glossary-list {
    margin: 0;
}

.glossary-entry {
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.glossary-entry:first-child {
    padding-top: 0;
}

.glossary-entry:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.glossary-entry dt {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.glossary-entry dd {
    margin: 0;
}

.glossary-entry dd p {
    margin-bottom: var(--space-sm);
}

.glossary-link {
    text-decoration-style: dotted;
}

.back-link {
    font-family: var(--font-sans);
    font-size: 0.875rem;
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-text);
    color: var(--color-bg);
    padding: var(--space-xl) var(--space-md);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.build-counter {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: rgba(250, 250, 250, 0.7);
    margin: 0;
}

.bluesky-section h3 {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    color: var(--color-bg);
}

.bluesky-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-bg);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
}

.bluesky-link:hover {
    color: rgba(250, 250, 250, 0.8);
}

.bluesky-icon {
    flex-shrink: 0;
}

.footer-bottom {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(250, 250, 250, 0.2);
}

.back-to-top {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: rgba(250, 250, 250, 0.7);
}

.back-to-top:hover {
    color: var(--color-bg);
}

/* ---- Responsive Design ---- */

/* Tablet and up */
@media (min-width: 640px) {
    h1 {
        font-size: 2.625rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-headline {
        font-size: 2.5rem;
    }

    .book {
        width: 320px;
        height: 400px;
    }

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

    .page-content {
        font-size: 1.375rem;
    }

    .step-link {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .slider-option {
        padding: var(--space-sm) var(--space-md);
        font-size: 1rem;
    }

    .footer-main {
        flex-direction: row;
        justify-content: space-between;
        align-items: flex-start;
    }
}

/* Desktop */
@media (min-width: 900px) {
    .hero-content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl);
        align-items: center;
    }

    .book-container {
        margin-bottom: 0;
    }

    .hero-blurb {
        max-width: none;
    }
}

/* Large screens */
@media (min-width: 1200px) {
    .hero {
        padding: var(--space-xxl) var(--space-xl);
    }

    .step-section,
    .content-section {
        padding: var(--space-xxl) var(--space-xl);
    }
}

/* ---- Print Styles ---- */
@media print {
    .sticky-nav,
    .book-container,
    .audience-slider,
    .cta-button,
    .back-link,
    .bluesky-section,
    .back-to-top {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        color: black;
        background: white;
    }

    .hero {
        min-height: auto;
        padding: 2cm 0;
    }

    .step-section,
    .content-section {
        padding: 1cm 0;
        page-break-inside: avoid;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    .audience-content.hidden,
    .audience-content-step5.hidden {
        display: block;
    }

    .audience-content::before,
    .audience-content-step5::before {
        content: attr(data-audience) " sector:";
        display: block;
        font-weight: bold;
        margin-bottom: 0.5cm;
        text-transform: capitalize;
    }
}