/* ========================================
   REFINED EDITORIAL DESIGN SYSTEM
   Academic Excellence Meets Digital Sophistication
   ======================================== */

:root {
    /* Color Palette - Academic & Bibliophile */
    --color-navy: #1a2642;
    --color-navy-light: #2d3f5f;
    --color-navy-dark: #0f1829;
    --color-cream: #f9f6f1;
    --color-cream-dark: #f1ebe0;
    --color-burgundy: #8b2635;
    --color-burgundy-light: #a94452;
    --color-gold: #c9a961;
    --color-gold-light: #d4b878;
    --color-slate: #4a5568;
    --color-slate-light: #718096;
    --color-slate-lighter: #cbd5e0;
    --color-white: #ffffff;
    --color-success: #2d7a4f;
    --color-error: #c53030;

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.813rem;
    --font-size-sm: 0.938rem;
    --font-size-base: 1.063rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.75rem;
    --font-size-2xl: 2.5rem;
    --font-size-3xl: 3.5rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.875rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 1.75rem;
    --spacing-xl: 2.5rem;
    --spacing-2xl: 3.5rem;
    --spacing-3xl: 5rem;

    /* Layout */
    --container-max-width: 680px;
    --border-radius: 4px;
    --border-radius-lg: 8px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(26, 38, 66, 0.08), 0 1px 2px rgba(26, 38, 66, 0.04);
    --shadow-md: 0 4px 8px rgba(26, 38, 66, 0.1), 0 2px 4px rgba(26, 38, 66, 0.06);
    --shadow-lg: 0 12px 24px rgba(26, 38, 66, 0.15), 0 4px 8px rgba(26, 38, 66, 0.08);
    --shadow-xl: 0 20px 40px rgba(26, 38, 66, 0.2), 0 8px 16px rgba(26, 38, 66, 0.1);

    /* Animation */
    --ease-elegant: cubic-bezier(0.4, 0.0, 0.2, 1);
    --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-navy);
    background-color: var(--color-cream);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding: var(--spacing-lg);
    position: relative;
    overflow-x: hidden;
}

@media (min-width: 768px) {
    body {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
}

/* Animated Background Texture */
.background-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
    background-image:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(26, 38, 66, 0.015) 2px,
            rgba(26, 38, 66, 0.015) 4px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(26, 38, 66, 0.015) 2px,
            rgba(26, 38, 66, 0.015) 4px
        );
    animation: textureFloat 60s linear infinite;
}

@keyframes textureFloat {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

/* ========================================
   CONTAINER
   ======================================== */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-cream) 100%);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 1;
    animation: containerFadeIn 0.8s var(--ease-elegant);
    border: 1px solid rgba(201, 169, 97, 0.2);
}

@keyframes containerFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   HEADER
   ======================================== */

header {
    position: relative;
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: linear-gradient(165deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    color: var(--color-cream);
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(201, 169, 97, 0.15) 0%, transparent 70%);
    animation: headerGlow 8s ease-in-out infinite;
}

@keyframes headerGlow {
    0%, 100% { transform: translate(20%, -40%) scale(1); opacity: 0.5; }
    50% { transform: translate(30%, -30%) scale(1.2); opacity: 0.7; }
}

.header-accent {
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-burgundy) 100%);
}

.header-content {
    position: relative;
    z-index: 1;
    animation: headerContentSlide 0.8s var(--ease-elegant) 0.2s backwards;
}

@keyframes headerContentSlide {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.logo-mark {
    display: inline-block;
    margin-bottom: var(--spacing-md);
    color: var(--color-gold);
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-4px); }
}

header h1 {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-cream);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.subtitle {
    font-size: var(--font-size-base);
    color: var(--color-gold-light);
    font-weight: 300;
    letter-spacing: 0.02em;
    font-style: italic;
}

@media (min-width: 768px) {
    header h1 {
        font-size: var(--font-size-3xl);
    }

    .subtitle {
        font-size: var(--font-size-lg);
    }
}

/* ========================================
   MAIN CONTENT
   ======================================== */

main {
    padding: var(--spacing-2xl) var(--spacing-xl);
    animation: mainFadeIn 0.8s var(--ease-elegant) 0.4s backwards;
}

@keyframes mainFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   FORM SECTIONS
   ======================================== */

.form-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-slate-lighter);
    animation: sectionSlide 0.6s var(--ease-elegant) backwards;
}

.form-section:nth-child(1) { animation-delay: 0.5s; }
.form-section:nth-child(2) { animation-delay: 0.6s; }

@keyframes sectionSlide {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.section-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
    position: relative;
    padding-left: var(--spacing-md);
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 70%;
    background: linear-gradient(180deg, var(--color-burgundy) 0%, var(--color-gold) 100%);
    border-radius: 2px;
}

/* ========================================
   FORM LAYOUT
   ======================================== */

.textbook-form {
    display: flex;
    flex-direction: column;
}

.form-row {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .form-row {
        grid-template-columns: 1fr 1fr;
    }
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   LABELS
   ======================================== */

label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-navy);
    letter-spacing: 0.01em;
    text-transform: uppercase;
    font-family: var(--font-body);
}

.optional {
    color: var(--color-slate-light);
    font-weight: 400;
    text-transform: lowercase;
    font-size: var(--font-size-xs);
    font-style: italic;
}

/* ========================================
   INPUT FIELDS
   ======================================== */

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
    padding: 0.875rem 1.125rem;
    font-size: var(--font-size-base);
    font-family: var(--font-body);
    color: var(--color-navy);
    background-color: var(--color-white);
    border: 2px solid var(--color-slate-lighter);
    border-radius: var(--border-radius);
    transition: all 0.25s var(--ease-elegant);
    outline: none;
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="tel"]::placeholder,
textarea::placeholder {
    color: var(--color-slate-light);
    font-style: italic;
}

input[type="text"]:hover,
input[type="email"]:hover,
input[type="tel"]:hover,
select:hover,
textarea:hover {
    border-color: var(--color-slate);
    background-color: var(--color-cream);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus,
textarea:focus {
    border-color: var(--color-burgundy);
    background-color: var(--color-white);
    box-shadow: 0 0 0 4px rgba(139, 38, 53, 0.1);
    transform: translateY(-1px);
}

/* Select Styling */
select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='14' height='9' viewBox='0 0 14 9' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L7 7.5L13 1.5' stroke='%234a5568' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.125rem center;
    padding-right: 3rem;
}

/* Textarea */
textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

/* ========================================
   ISBN INPUT WRAPPER
   ======================================== */

.isbn-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
}

.isbn-input-wrapper input {
    flex: 1;
}

/* ========================================
   SCAN BUTTON
   ======================================== */

.scan-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.25rem;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    color: var(--color-gold);
    border: 2px solid var(--color-navy);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease-elegant);
    white-space: nowrap;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-sm);
}

.scan-btn:hover {
    background: linear-gradient(135deg, var(--color-burgundy) 0%, var(--color-burgundy-light) 100%);
    border-color: var(--color-burgundy);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.scan-btn svg {
    flex-shrink: 0;
    transition: transform 0.3s var(--ease-elegant);
}

.scan-btn:hover svg {
    transform: scale(1.1);
}

/* ========================================
   ERROR MESSAGES
   ======================================== */

.error-message {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    font-weight: 500;
    display: none;
    animation: errorSlide 0.3s var(--ease-elegant);
}

@keyframes errorSlide {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.error-message.show {
    display: block;
}

input:invalid:not(:placeholder-shown),
select:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
    background-color: rgba(197, 48, 48, 0.05);
}

/* ========================================
   SUBMIT BUTTON
   ======================================== */

.submit-btn {
    width: 100%;
    padding: 1.125rem 2.5rem;
    font-size: var(--font-size-lg);
    font-weight: 600;
    font-family: var(--font-display);
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-burgundy) 0%, var(--color-burgundy-light) 100%);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.35s var(--ease-elegant);
    letter-spacing: 0.02em;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    animation: buttonFadeIn 0.6s var(--ease-elegant) 0.8s backwards;
}

@keyframes buttonFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.submit-btn:hover::before {
    width: 300px;
    height: 300px;
}

.submit-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:active:not(:disabled) {
    transform: translateY(-1px);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ========================================
   LOADING STATE
   ======================================== */

.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* ========================================
   SUCCESS MESSAGE
   ======================================== */

.success-message {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    animation: successFadeIn 0.8s var(--ease-elegant);
}

@keyframes successFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-xl);
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(45, 122, 79, 0.15) 0%, rgba(45, 122, 79, 0.05) 100%);
    animation: successIconPulse 0.8s var(--ease-elegant);
}

@keyframes successIconPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.success-icon svg {
    color: var(--color-success);
    animation: successCheckDraw 0.8s var(--ease-elegant) 0.2s backwards;
}

@keyframes successCheckDraw {
    from {
        opacity: 0;
        transform: scale(0.5) rotate(-10deg);
    }
    to {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

.success-message h2 {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.success-message p {
    font-size: var(--font-size-lg);
    color: var(--color-slate);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   RESET BUTTON
   ======================================== */

.reset-btn {
    padding: 0.875rem 2rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-navy);
    background-color: var(--color-white);
    border: 2px solid var(--color-navy);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s var(--ease-elegant);
    box-shadow: var(--shadow-sm);
}

.reset-btn:hover {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   FOOTER
   ======================================== */

footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: center;
    border-top: 1px solid rgba(201, 169, 97, 0.2);
    background: linear-gradient(180deg, transparent 0%, rgba(26, 38, 66, 0.02) 100%);
}

footer p {
    font-size: var(--font-size-sm);
    color: var(--color-slate-light);
    letter-spacing: 0.05em;
    font-weight: 300;
}

/* ========================================
   SCANNER MODAL
   ======================================== */

.scanner-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 38, 66, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    animation: modalFadeIn 0.3s var(--ease-elegant);
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.scanner-content {
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-cream) 100%);
    border-radius: var(--border-radius-lg);
    max-width: 600px;
    width: 100%;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(201, 169, 97, 0.3);
    animation: modalSlideUp 0.4s var(--ease-elegant);
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.scanner-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 2px solid rgba(201, 169, 97, 0.2);
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
}

.scanner-header h3 {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-cream);
    letter-spacing: -0.01em;
}

.close-scanner {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background-color: rgba(201, 169, 97, 0.2);
    border: none;
    border-radius: var(--border-radius);
    color: var(--color-gold);
    cursor: pointer;
    transition: all 0.25s var(--ease-elegant);
}

.close-scanner:hover {
    background-color: var(--color-burgundy);
    color: var(--color-white);
    transform: rotate(90deg);
}

.scanner-viewport {
    position: relative;
    background-color: var(--color-navy-dark);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.viewport {
    width: 100%;
    height: 100%;
}

.viewport canvas,
.viewport video {
    width: 100% !important;
    height: auto !important;
    display: block;
}

#interactive.viewport canvas.drawingBuffer {
    position: absolute;
    top: 0;
    left: 0;
}

.scanner-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    text-align: center;
    background: linear-gradient(180deg, var(--color-cream-dark) 0%, var(--color-cream) 100%);
    border-top: 2px solid rgba(201, 169, 97, 0.2);
}

.scanner-status {
    font-size: var(--font-size-base);
    color: var(--color-navy);
    margin: 0;
    font-weight: 500;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 640px) {
    body {
        padding: var(--spacing-sm);
    }

    header {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    header h1 {
        font-size: var(--font-size-xl);
    }

    .subtitle {
        font-size: var(--font-size-sm);
    }

    main {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .form-section {
        margin-bottom: var(--spacing-xl);
    }

    .section-title {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-md);
    }

    .form-group {
        margin-bottom: var(--spacing-md);
    }

    .isbn-input-wrapper {
        flex-direction: column;
    }

    .scan-btn {
        width: 100%;
    }

    .scanner-modal {
        padding: var(--spacing-sm);
    }

    .scanner-viewport {
        min-height: 300px;
    }

    .success-message {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .success-message h2 {
        font-size: var(--font-size-xl);
    }

    .success-message p {
        font-size: var(--font-size-base);
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

:focus-visible {
    outline: 3px solid var(--color-burgundy);
    outline-offset: 3px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-burgundy);
    outline-offset: 3px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark mode support (optional future enhancement) */
@media (prefers-color-scheme: dark) {
    /* Can add dark mode styles here if desired */
}