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

:root {
    /* Color Palette - Premium Gradients */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --dark-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

    /* Solid Colors */
    --bg-dark: #0f0f1e;
    --bg-card: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --text-muted: #7c7c99;
    --border-color: rgba(255, 255, 255, 0.1);
    --error-color: #ff6b6b;
    --success-color: #51cf66;

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

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
}

/* ============================================
   Global Styles
   ============================================ */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-dark);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* ============================================
   Header Styles
   ============================================ */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.8s ease;
}

.title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    font-weight: var(--font-weight-light);
}

/* ============================================
   Form Styles
   ============================================ */
.form-container {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.webhook-form {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.webhook-form:hover {
    box-shadow: var(--shadow-glow);
    border-color: rgba(102, 126, 234, 0.3);
}

.input-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.input-label {
    display: block;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-field {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1rem;
    font-family: var(--font-family);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-normal);
}

.input-field::placeholder {
    color: var(--text-muted);
}

.input-field:focus {
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.input-field:hover:not(:focus) {
    border-color: rgba(255, 255, 255, 0.2);
}

.optional-label {
    font-size: 0.75rem;
    font-weight: var(--font-weight-normal);
    color: var(--text-muted);
    text-transform: none;
    letter-spacing: normal;
}

.input-hint {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.hint-link {
    color: #667eea;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.hint-link:hover {
    color: #764ba2;
    text-decoration: underline;
}


.submit-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.submit-btn:hover::before {
    left: 100%;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}

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

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

.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   Message Styles
   ============================================ */
.error-message,
.success-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    animation: slideIn 0.3s ease;
}

.error-message {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    color: var(--error-color);
}

.success-message {
    background: rgba(81, 207, 102, 0.1);
    border: 1px solid rgba(81, 207, 102, 0.3);
    color: var(--success-color);
}

/* ============================================
   Gallery Styles
   ============================================ */
.gallery-section {
    animation: fadeInUp 0.8s ease;
}

.gallery-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.gallery-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.gallery-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

@media (min-width: 768px) {
    .image-gallery {
        grid-template-columns: repeat(3, 1fr);
    }
}

.image-card {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-normal);
    animation: scaleIn 0.5s ease backwards;
}

.image-card:nth-child(1) {
    animation-delay: 0.1s;
}

.image-card:nth-child(2) {
    animation-delay: 0.2s;
}

.image-card:nth-child(3) {
    animation-delay: 0.3s;
}

.image-card:nth-child(4) {
    animation-delay: 0.4s;
}

.image-card:nth-child(5) {
    animation-delay: 0.5s;
}

.image-card:nth-child(6) {
    animation-delay: 0.6s;
}

.image-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-glow);
    border-color: rgba(102, 126, 234, 0.5);
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.image-card:hover img {
    transform: scale(1.1);
}

.image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.image-card:hover .image-overlay {
    opacity: 1;
}

.image-title {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

/* ============================================
   Selection Action Bar
   ============================================ */
.selection-action-bar {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    animation: fadeInUp 0.5s ease;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.selection-action-bar:hover {
    box-shadow: var(--shadow-glow);
    border-color: rgba(102, 126, 234, 0.3);
}

.selection-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.selection-counter {
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.selection-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.action-btn svg {
    transition: transform var(--transition-fast);
}

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

.download-btn {
    background: var(--primary-gradient);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.download-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.download-btn:hover:not(:disabled)::before {
    left: 100%;
}

.cancel-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.cancel-btn:hover:not(:disabled) {
    background: rgba(255, 107, 107, 0.1);
    border-color: rgba(255, 107, 107, 0.3);
    color: var(--error-color);
    transform: translateY(-2px);
}

.action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.action-btn:active:not(:disabled) {
    transform: translateY(0);
}

/* ============================================
   Image Selection States
   ============================================ */
.image-card.selected {
    border: 3px solid #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2), var(--shadow-glow);
    transform: scale(1.02);
}

.image-card.selected::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(102, 126, 234, 0.1);
    pointer-events: none;
}

.selection-checkbox {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 32px;
    height: 32px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.image-card:hover .selection-checkbox {
    background: rgba(0, 0, 0, 0.8);
    border-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.1);
}

.image-card.selected .selection-checkbox {
    background: var(--primary-gradient);
    border-color: #667eea;
    transform: scale(1.15);
}

.selection-checkbox svg {
    width: 18px;
    height: 18px;
    stroke: white;
    stroke-width: 3;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.image-card.selected .selection-checkbox svg {
    opacity: 1;
}

/* Responsive adjustments for action bar */
@media (max-width: 768px) {
    .selection-action-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .selection-info {
        justify-content: center;
    }

    .selection-actions {
        flex-direction: column;
    }

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


/* ============================================
   Loading State
   ============================================ */
.loading-state {
    text-align: center;
    padding: var(--spacing-xl);
    animation: fadeIn 0.5s ease;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-text {
    color: var(--text-secondary);
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
}

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

    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

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

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .webhook-form {
        padding: var(--spacing-md);
    }

    .image-gallery {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header {
        margin-bottom: var(--spacing-lg);
    }

    .input-field {
        padding: var(--spacing-sm);
    }

    .submit-btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}