/* ===================================
   CSS Custom Properties - Design System
   =================================== */
:root {
    /* Colors - Dark Navy & Slate Theme */
    --color-bg-primary: #0a1929;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-surface: #1e293b;
    --color-surface-elevated: #2d3748;

    /* Accent Colors */
    --color-accent-primary: #3b82f6;
    --color-accent-secondary: #60a5fa;
    --color-accent-glow: rgba(59, 130, 246, 0.3);
    --color-success: #10b981;
    --color-warning: #f59e0b;

    /* Text Colors */
    --color-text-primary: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-tertiary: #64748b;

    /* Typography */
    --font-family: 'Inter', -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: 2rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--color-accent-glow);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* ===================================
   Background Grid Effect
   =================================== */
.background-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

/* ===================================
   Layout
   =================================== */
.container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ===================================
   Header
   =================================== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* AI Status Indicator */
.ai-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-bg-tertiary);
    cursor: help;
    transition: all var(--transition-base);
}

.ai-status:hover {
    border-color: var(--color-accent-primary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-text-tertiary);
    transition: background var(--transition-base);
}

.ai-status.active .status-dot {
    background: var(--color-success);
    box-shadow: 0 0 8px var(--color-success);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

.status-text {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Settings Button */
.settings-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.settings-btn:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-accent-primary);
    transform: rotate(90deg);
}

.settings-btn:active {
    transform: rotate(90deg) scale(0.95);
}

.settings-icon {
    font-size: var(--font-size-xl);
}

/* Settings button pulse animation when no API key */
.settings-btn.pulse {
    animation: settingsPulse 2s ease-in-out infinite;
}

@keyframes settingsPulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 var(--color-accent-glow);
    }

    50% {
        box-shadow: 0 0 0 8px transparent;
    }
}

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

.logo-bracket {
    color: var(--color-accent-primary);
    font-family: 'Courier New', monospace;
}

.logo-text {
    color: var(--color-text-primary);
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* ===================================
   Modal
   =================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 25, 41, 0.9);
    backdrop-filter: blur(8px);
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border: 1px solid rgba(59, 130, 246, 0.2);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp var(--transition-base);
}

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

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-bg-tertiary);
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.close-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: all var(--transition-base);
}

.close-btn:hover {
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-xl);
}

.settings-section {
    margin-bottom: var(--spacing-lg);
}

.settings-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.settings-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.input-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.api-key-input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.api-key-input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.api-key-input::placeholder {
    color: var(--color-text-tertiary);
    font-family: var(--font-family);
}

.api-key-info {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent-primary);
}

.info-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.info-list {
    margin-left: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

.info-list li {
    margin-bottom: var(--spacing-xs);
}

.info-list a {
    color: var(--color-accent-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.info-list a:hover {
    color: var(--color-accent-primary);
    text-decoration: underline;
}

.security-warning {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid var(--color-warning);
    border-radius: var(--radius-md);
}

.warning-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-bg-tertiary);
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 44px;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-bg-tertiary);
}

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


/* ===================================
   Card Component
   =================================== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(59, 130, 246, 0.1);
    backdrop-filter: blur(10px);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* ===================================
   Section Titles
   =================================== */
.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
}

.title-icon {
    font-size: var(--font-size-2xl);
}

/* ===================================
   Input Section
   =================================== */
.input-section {
    margin-bottom: var(--spacing-xl);
}

.article-input {
    width: 100%;
    min-height: 250px;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    resize: vertical;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.article-input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.article-input::placeholder {
    color: var(--color-text-tertiary);
}

.input-meta {
    margin-top: var(--spacing-sm);
    text-align: right;
}

.char-count {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-family: 'Courier New', monospace;
}

/* ===================================
   Generate Button
   =================================== */
.button-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.generate-btn {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    overflow: hidden;
    min-height: 56px;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

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

.btn-icon {
    font-size: var(--font-size-xl);
}

.btn-text {
    font-family: var(--font-family);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.generate-btn:hover .btn-glow {
    left: 100%;
}

/* ===================================
   Output Section
   =================================== */
.output-section {
    margin-bottom: var(--spacing-xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.output-content {
    background: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-accent-primary);
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-primary);
}

/* ===================================
   Copy Buttons
   =================================== */
.copy-btn,
.copy-prompt-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-accent-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 44px;
}

.copy-btn:hover,
.copy-prompt-btn:hover {
    background: var(--color-accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.copy-icon {
    font-size: var(--font-size-base);
}

.copy-text {
    font-family: var(--font-family);
}

.copy-feedback {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-success);
    color: white;
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 500;
    animation: slideIn var(--transition-base);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

/* ===================================
   Visual Section
   =================================== */
.visual-section {
    margin-bottom: var(--spacing-xl);
}

.visual-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.visual-prompt {
    background: var(--color-bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--color-accent-primary);
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.heart {
    color: #ef4444;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

/* ===================================
   Utility Classes
   =================================== */
.hidden {
    display: none !important;
}

/* ===================================
   Responsive Design - Mobile First
   =================================== */

/* Tablets and up */
@media (min-width: 768px) {
    .container {
        padding: var(--spacing-xl);
    }

    .header {
        padding-top: var(--spacing-2xl);
    }

    .logo {
        font-size: clamp(2rem, 4vw, 3rem);
    }

    .article-input {
        min-height: 300px;
    }

    .card {
        padding: var(--spacing-2xl);
    }
}

/* Desktop and up */
@media (min-width: 1024px) {
    .article-input {
        min-height: 350px;
    }

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

/* Small mobile devices */
@media (max-width: 480px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.25rem;
    }

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

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

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

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

/* ===================================
   Loading State
   =================================== */
.generate-btn.loading .btn-text::after {
    content: '';
    animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
    0% {
        content: '';
    }

    25% {
        content: '.';
    }

    50% {
        content: '..';
    }

    75% {
        content: '...';
    }

    100% {
        content: '';
    }
}

/* ===================================
   Accessibility
   =================================== */
@media (prefers-reduced-motion: reduce) {

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

/* Focus visible for keyboard navigation */
button:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}