/* Color Palette */
:root {
    --color-leather: #5C3D2E;
    --color-parchment: #FEFCF9;
    --color-vellum: #F7F2EB;
    --color-taupe: #6B5E52;
    --color-pink: #E8368F;
    --color-tangerine: #FF7A2F;
    --color-green: #2ECC71;
    --color-blue: #3498DB;
    --color-violet: #9B59B6;
    --color-gold: #B8960C;
    --color-binding: #D4C5B2;
    --color-inkwell: #3A3228;
    --color-patina: #8A7E72;
    --color-cream: #E8DFD3;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-inkwell);
    background-color: var(--color-leather);
    overflow-x: hidden;
    position: relative;
}

/* Background Leather Texture */
.background-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-leather);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(92, 61, 46, 0.9) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(72, 48, 35, 0.6) 0%, transparent 50%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 47px,
            rgba(40, 25, 15, 0.06) 47px,
            rgba(40, 25, 15, 0.06) 48px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 31px,
            rgba(40, 25, 15, 0.04) 31px,
            rgba(40, 25, 15, 0.04) 32px
        );
    background-size: 100% 100%, 100% 100%, 100% 100%, 100% 100%;
    background-attachment: fixed;
    z-index: 0;
}

/* Spine Line */
.spine {
    position: fixed;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: var(--color-binding);
    opacity: 0.5;
    z-index: 1;
    transform: translateX(-50%);
    pointer-events: none;
}

/* Top Ornament */
.top-ornament {
    position: relative;
    z-index: 2;
    text-align: center;
    font-size: 20px;
    color: var(--color-gold);
    text-shadow: 0 0 4px rgba(184, 150, 12, 0.3);
    padding-top: 40px;
    margin-bottom: 20px;
    letter-spacing: 8px;
}

/* Tab Stack Container */
.tab-stack {
    position: fixed;
    right: 20px;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 10;
    pointer-events: all;
}

.tab-item {
    width: 24px;
    height: 60px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0.7;
}

.tab-item:hover {
    opacity: 1;
    transform: translateX(4px);
}

/* Content Wrapper */
.content-wrapper {
    position: relative;
    z-index: 2;
    max-width: 640px;
    margin: 0 auto;
    padding: 80px 40px;
}

/* Page Layout */
.page {
    margin-bottom: 120px;
    animation: fadeIn 0.6s ease-out;
    position: relative;
}

.page:first-child {
    margin-top: 0px;
}

.page:last-child {
    margin-bottom: 80px;
}

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

/* Page Tab Protrusion */
.page-tab {
    position: absolute;
    right: -24px;
    top: 40px;
    width: 24px;
    height: 60px;
    border-radius: 0 4px 4px 0;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.page:hover .page-tab {
    opacity: 1;
    right: -20px;
}

/* Page Content */
.page-content {
    background: linear-gradient(
        180deg,
        var(--color-parchment) 0%,
        var(--color-vellum) 100%
    );
    padding: 60px 50px;
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px var(--color-binding);
    position: relative;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.page-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(
            0deg,
            rgba(212, 197, 178, 0.5) 0%,
            rgba(212, 197, 178, 0.1) 50%,
            transparent 100%
        ),
        repeating-linear-gradient(
            90deg,
            transparent 0px,
            rgba(0, 0, 0, 0.01) 2px,
            transparent 4px
        );
    pointer-events: none;
    border-radius: 4px;
}

/* Ornament After Section */
.ornament-after {
    text-align: center;
    font-size: 18px;
    color: var(--color-gold);
    text-shadow: 0 0 4px rgba(184, 150, 12, 0.3);
    margin-top: 40px;
    opacity: 0;
    animation: pulseOrnament 0.5s ease-out forwards;
    animation-delay: 0.2s;
}

@keyframes pulseOrnament {
    from {
        opacity: 0.4;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Bottom Ornament */
.bottom-ornament {
    text-align: center;
    font-size: 16px;
    color: var(--color-gold);
    text-shadow: 0 0 4px rgba(184, 150, 12, 0.3);
    margin-top: 60px;
    padding-bottom: 40px;
}

/* Typography */
.page-title {
    font-family: 'Literata', serif;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 600;
    color: var(--color-inkwell);
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    text-shadow: 1px 1px 0 rgba(184, 150, 12, 0.15);
}

.page-subtitle {
    font-family: 'Literata', serif;
    font-size: clamp(1.1rem, 2.2vw, 1.4rem);
    font-weight: 400;
    font-style: italic;
    color: var(--color-taupe);
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.page-heading {
    font-family: 'Source Sans 3', sans-serif;
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 600;
    color: var(--color-inkwell);
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
    letter-spacing: 0.01em;
}

.page-text {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 18px;
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-inkwell);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.page-text:last-child {
    margin-bottom: 0;
}

/* Pull Quotes */
.pull-quote {
    display: block;
    font-family: 'Literata', serif;
    font-size: 1.1rem;
    font-style: italic;
    line-height: 1.7;
    color: var(--color-taupe);
    margin: 30px 0;
    padding: 20px 30px;
    border: 3px double var(--color-binding);
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.3);
}

/* Lists */
.feature-list {
    list-style: none;
    margin: 40px 0 0 0;
    position: relative;
    z-index: 1;
}

.feature-item {
    padding: 15px 0 15px 30px;
    position: relative;
    border-left: 2px solid var(--color-pink);
    margin-bottom: 15px;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-inkwell);
}

.feature-item:before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--color-pink);
    font-weight: bold;
}

/* Values Grid */
.values-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-top: 40px;
    position: relative;
    z-index: 1;
}

.value-card {
    padding: 30px;
    border: 1px solid var(--color-binding);
    background: rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.value-card:hover {
    background: rgba(255, 255, 255, 0.6);
    border-color: var(--color-pink);
}

.value-title {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--color-inkwell);
    margin-bottom: 12px;
}

.value-card p {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-patina);
}

/* Buttons */
.interactive-btn,
.cta-btn {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 16px;
    font-weight: 400;
    padding: 16px 32px;
    border: 2px solid var(--color-inkwell);
    background: transparent;
    color: var(--color-inkwell);
    cursor: pointer;
    transition: all 0.1s ease;
    margin-top: 30px;
    position: relative;
    z-index: 1;
    letter-spacing: 0.01em;
}

.interactive-btn:hover,
.cta-btn:hover {
    background: var(--color-inkwell);
    color: var(--color-parchment);
}

.cta-btn {
    background: var(--color-pink);
    color: var(--color-parchment);
    border-color: var(--color-pink);
}

.cta-btn:hover {
    background: var(--color-tangerine);
    border-color: var(--color-tangerine);
}

/* Shake Animation with Color Flash */
@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    15%, 45%, 75% {
        transform: translateX(-3px);
    }
    30%, 60%, 90% {
        transform: translateX(3px);
    }
}

@keyframes shakeColorFlash {
    0%, 100% {
        border-color: var(--color-inkwell);
    }
    50% {
        border-color: var(--color-pink);
    }
}

.shake {
    animation: shake 0.4s ease-in-out, shakeColorFlash 0.4s ease-in-out;
}

/* Responsive Design */
@media (max-width: 768px) {
    .content-wrapper {
        padding: 60px 24px;
    }

    .page {
        margin-bottom: 80px;
    }

    .page-content {
        padding: 40px 30px;
    }

    .page-title {
        font-size: 48px;
    }

    .page-subtitle {
        font-size: 22px;
    }

    .page-heading {
        font-size: 32px;
    }

    .page-text {
        font-size: 16px;
    }

    .spine {
        display: none;
    }

    .page-tab {
        display: none;
    }

    .tab-stack {
        display: none;
    }

    .values-grid {
        gap: 20px;
    }

    .top-ornament {
        padding-top: 20px;
        margin-bottom: 10px;
    }
}

@media (max-width: 480px) {
    .content-wrapper {
        padding: 40px 16px;
    }

    .page {
        margin-bottom: 60px;
    }

    .page:first-child {
        margin-top: 0px;
    }

    .page-content {
        padding: 30px 20px;
    }

    .page-title {
        font-size: 36px;
        margin-bottom: 16px;
    }

    .page-subtitle {
        font-size: 18px;
    }

    .page-heading {
        font-size: 24px;
    }

    .page-text {
        font-size: 15px;
        line-height: 1.6;
    }

    .interactive-btn,
    .cta-btn {
        font-size: 14px;
        padding: 12px 24px;
    }

    .pull-quote {
        font-size: 1rem;
        padding: 15px 20px;
    }
}