/* ===== CSS VARIABLES & DESIGN TOKENS ===== */
:root {
    /* Beige & Pastel Color Palette */
    --color-beige-50: #faf8f5;
    --color-beige-100: #f5f0e8;
    --color-beige-200: #ebe3d5;
    --color-beige-300: #ddd2be;
    --color-beige-400: #c9b89a;
    --color-beige-500: #b9a67e;

    --color-pastel-pink: #fce4e8;
    --color-pastel-pink-dark: #e8b4bc;
    --color-pastel-lavender: #e8e4f8;
    --color-pastel-lavender-dark: #c4b8e8;
    --color-pastel-mint: #e4f5ed;
    --color-pastel-mint-dark: #a8d8c0;
    --color-pastel-peach: #fce8dc;
    --color-pastel-peach-dark: #e8c4a8;
    --color-pastel-sky: #e4f0f8;
    --color-pastel-sky-dark: #a8c8e0;

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Accent Colors */
    --color-primary: #8b7355;
    --color-primary-light: #a89070;
    --color-primary-dark: #6d5a44;
    --color-success: #65a886;
    --color-success-light: #e4f5ed;
    --color-error: #e07878;
    --color-error-light: #fce4e8;
    --color-warning: #e0a878;
    --color-warning-light: #fce8dc;

    /* Typography */
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(139, 115, 85, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ===== RESET & BASE STYLES ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-700);
    background: linear-gradient(135deg, var(--color-beige-50) 0%, var(--color-beige-100) 50%, var(--color-pastel-peach) 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== LAYOUT ===== */
.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-6);
    padding-top: var(--spacing-8);
}

/* ===== HEADER ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-10);
    animation: fadeInDown 0.6s ease;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-3);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.logo-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-white);
}

.logo-text {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-800);
    letter-spacing: -0.02em;
}

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

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-gray-500);
    font-weight: 500;
}

.nav-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-12);
    margin-top: var(--spacing-6);
}

.nav-links a {
    color: var(--color-gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-lg);
    padding: var(--spacing-2) var(--spacing-3);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-primary);
}

.nav-links a.active {
    color: var(--color-primary);
}

/* Ad Container */
.ad-container {
    margin-top: var(--spacing-6);
    padding: var(--spacing-4);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-beige-200);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-container ins {
    width: 100%;
}

/* ===== INTRO CARD ===== */
.intro-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    margin-bottom: var(--spacing-8);
    box-shadow: var(--shadow-lg);
    text-align: center;
    border: 1px solid var(--color-beige-200);
    animation: fadeInUp 0.6s ease 0.1s both;
}

.intro-card h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-4);
    line-height: 1.3;
}

.intro-card p {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    max-width: 650px;
    margin: 0 auto;
}

/* ===== SECTIONS ===== */
.input-section,
.tone-section,
.results-section,
.tips-section {
    margin-bottom: var(--spacing-8);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-5);
}

.step-badge {
    background: linear-gradient(135deg, var(--color-pastel-lavender) 0%, var(--color-pastel-lavender-dark) 100%);
    color: var(--color-gray-700);
    font-size: var(--font-size-sm);
    font-weight: 600;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-full);
}

.step-badge.success {
    background: linear-gradient(135deg, var(--color-pastel-mint) 0%, var(--color-pastel-mint-dark) 100%);
}

.section-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-800);
}

/* ===== INPUT CARD ===== */
.input-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-beige-200);
}

.textarea-wrapper {
    position: relative;
    margin-bottom: var(--spacing-5);
}

#reviewInput {
    width: 100%;
    padding: var(--spacing-5);
    border: 2px solid var(--color-beige-200);
    border-radius: var(--radius-xl);
    font-family: inherit;
    font-size: var(--font-size-base);
    line-height: 1.6;
    resize: vertical;
    min-height: 160px;
    transition: all var(--transition-base);
    background: var(--color-beige-50);
}

#reviewInput:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 4px rgba(139, 115, 85, 0.1);
}

#reviewInput::placeholder {
    color: var(--color-gray-400);
}

.char-count {
    position: absolute;
    bottom: var(--spacing-3);
    right: var(--spacing-4);
    font-size: var(--font-size-xs);
    color: var(--color-gray-400);
}

.business-info label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-2);
}

.business-info input {
    width: 100%;
    padding: var(--spacing-4);
    border: 2px solid var(--color-beige-200);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-base);
    background: var(--color-beige-50);
    transition: all var(--transition-base);
}

.business-info input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 4px rgba(139, 115, 85, 0.1);
}

/* ===== TONE SELECTION ===== */
.tone-section {
    animation-delay: 0.3s;
}

.tone-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-4);
}

.tone-card {
    background: var(--color-white);
    border: 2px solid var(--color-beige-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.tone-card.active {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-beige-50) 0%, var(--color-beige-100) 100%);
    box-shadow: var(--shadow-lg), inset 0 -3px 0 var(--color-primary);
}

.tone-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-3);
    transition: transform var(--transition-bounce);
}

.tone-card:hover .tone-icon,
.tone-card.active .tone-icon {
    transform: scale(1.15);
}

.tone-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-1);
}

.tone-card p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ===== GENERATE BUTTON ===== */
.generate-section {
    text-align: center;
    margin-bottom: var(--spacing-10);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.generate-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-5) var(--spacing-10);
    border-radius: var(--radius-full);
    font-family: inherit;
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.generate-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl), 0 0 30px rgba(139, 115, 85, 0.25);
}

.generate-btn:active {
    transform: translateY(-1px);
}

.generate-btn.loading {
    pointer-events: none;
    opacity: 0.8;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base);
}

.generate-btn:hover .btn-icon {
    transform: translateX(4px);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

.generate-hint {
    margin-top: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ===== RESULTS SECTION ===== */
.results-section {
    display: none;
    animation-delay: 0;
}

.results-section.visible {
    display: block;
    animation: fadeInUp 0.5s ease;
}

.loading-state {
    display: none;
    text-align: center;
    padding: var(--spacing-12);
}

.loading-state.visible {
    display: block;
}

.loading-animation {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.loading-dot {
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    animation: loadingBounce 1.4s infinite ease-in-out both;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0;
}

@keyframes loadingBounce {

    0%,
    80%,
    100% {
        transform: scale(0.6);
        opacity: 0.5;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.loading-state p {
    color: var(--color-gray-500);
    font-weight: 500;
}

.result-card {
    display: none;
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-beige-200);
    overflow: hidden;
}

.result-card.visible {
    display: block;
    animation: scaleIn 0.4s var(--transition-bounce);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-5) var(--spacing-6);
    background: linear-gradient(135deg, var(--color-pastel-mint) 0%, var(--color-beige-100) 100%);
    border-bottom: 1px solid var(--color-beige-200);
}

.result-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-success);
}

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

.result-actions {
    display: flex;
    gap: var(--spacing-2);
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    border: 1px solid var(--color-beige-300);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    background: var(--color-beige-50);
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

.result-content {
    padding: var(--spacing-6);
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-gray-700);
    white-space: pre-wrap;
}

.result-footer {
    padding: 0 var(--spacing-6) var(--spacing-5);
}

.copy-success {
    display: none;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-success-light);
    color: var(--color-success);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    animation: fadeIn 0.3s ease;
}

.copy-success.visible {
    display: inline-flex;
}

.copy-success svg {
    width: 18px;
    height: 18px;
}

/* ===== TIPS SECTION ===== */
.tips-section {
    margin-top: var(--spacing-12);
    animation-delay: 0.5s;
}

.tips-section h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-6);
    text-align: center;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-5);
}

.tip-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-beige-200);
    text-align: center;
    transition: all var(--transition-base);
}

.tip-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tip-number {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-pastel-lavender) 0%, var(--color-pastel-lavender-dark) 100%);
    color: var(--color-gray-700);
    font-size: var(--font-size-lg);
    font-weight: 700;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
}

.tip-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-2);
}

.tip-card p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: var(--spacing-10) 0 var(--spacing-6);
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

.footer-links {
    margin-top: var(--spacing-5);
    display: flex;
    justify-content: center;
    gap: var(--spacing-8);
}

.footer-links a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-lg);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-lg);
    background: var(--color-beige-100);
    border: 2px solid var(--color-beige-200);
    transition: all var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-white);
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-4);
    }

    .logo-text {
        font-size: var(--font-size-2xl);
    }

    .intro-card {
        padding: var(--spacing-6);
    }

    .intro-card h1 {
        font-size: var(--font-size-xl);
    }

    .intro-card p {
        font-size: var(--font-size-base);
    }

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

    .tips-grid {
        grid-template-columns: 1fr;
    }

    .result-header {
        flex-direction: column;
        gap: var(--spacing-4);
        align-items: flex-start;
    }

    .generate-btn {
        width: 100%;
        justify-content: center;
    }
}

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

    .action-btn span {
        display: none;
    }
}