/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary: #1a237e;
    --primary-light: #3949ab;
    --primary-dark: #0d1642;
    --accent: #ff6f00;
    --accent-light: #ff9800;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --text: #212121;
    --text-secondary: #757575;
    --border: #e0e0e0;
    --success: #4caf50;
    --danger: #f44336;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 12px;
}

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

body {
    font-family: 'Vazirmatn', 'Tahoma', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===== Splash Screen ===== */
.splash {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.splash.hidden {
    opacity: 0;
    visibility: hidden;
}

.splash-content {
    text-align: center;
    color: white;
    padding: 2rem;
}

.splash-icon {
    font-size: 5rem;
    margin-bottom: 1rem;
    animation: bounce 1s ease infinite;
}

.splash h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.splash p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: rgba(255,255,255,0.2);
    border-radius: 2px;
    margin: 0 auto;
    overflow: hidden;
}

.loading-progress {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 2px;
    animation: load 1.5s ease forwards;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes load {
    0% { width: 0%; }
    100% { width: 100%; }
}

/* ===== App ===== */
.app {
    min-height: 100vh;
    padding-bottom: 2rem;
}

.app.hidden {
    display: none;
}

/* ===== Header ===== */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1.5rem 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 600px;
    margin: 0 auto;
}

.logo {
    font-size: 2rem;
}

.header h1 {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.3;
}

/* ===== Filters ===== */
.filters {
    background: var(--card-bg);
    margin: -1rem 1rem 1.5rem;
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    position: relative;
    z-index: 10;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.filter-group {
    margin-bottom: 1rem;
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.filter-group select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text);
    background: var(--bg);
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23757575' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 1rem center;
    background-size: 1.25rem;
    padding-left: 2.5rem;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(57, 73, 171, 0.1);
}

.filter-group select:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== Results ===== */
.results {
    padding: 0 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.empty-state p {
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Project Cards ===== */
.project-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    border-right: 4px solid var(--primary);
}

.project-card:active {
    transform: scale(0.98);
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.project-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.4;
    flex: 1;
}

.project-badge {
    background: var(--accent);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: 20px;
    white-space: nowrap;
    margin-right: 0.5rem;
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.meta-tag {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--bg);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
}

.project-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-footer {
    display: flex;
    gap: 0.5rem;
}

.btn {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:active {
    background: var(--primary-dark);
    transform: scale(0.97);
}

.btn-secondary {
    background: var(--bg);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:active {
    background: var(--primary);
    color: white;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-content {
    background: var(--card-bg);
    width: 100%;
    max-width: 600px;
    max-height: 85vh;
    border-radius: var(--radius) var(--radius) 0 0;
    overflow: hidden;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
}

.close-btn {
    background: var(--bg);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.close-btn:active {
    background: var(--border);
}

.modal-body {
    padding: 1.25rem;
    overflow-y: auto;
    flex: 1;
}

.modal-section {
    margin-bottom: 1.25rem;
}

.modal-section h4 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.modal-section p, .modal-section li {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text);
}

.modal-section ul {
    padding-right: 1.25rem;
}

.modal-section li {
    margin-bottom: 0.25rem;
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
}

.file-item:active {
    background: var(--border);
}

.file-icon {
    font-size: 1.5rem;
}

.file-info {
    flex: 1;
}

.file-name {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.download-icon {
    color: var(--primary);
    font-size: 1.2rem;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text);
    color: white;
    padding: 0.875rem 1.5rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s ease;
    white-space: nowrap;
    box-shadow: var(--shadow-lg);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    animation: fadeInUp 0.4s ease forwards;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
    .modal {
        align-items: center;
    }
    
    .modal-content {
        border-radius: var(--radius);
        transform: translateY(20px) scale(0.95);
        max-height: 80vh;
    }
    
    .modal.active .modal-content {
        transform: translateY(0) scale(1);
    }
    
    .header h1 {
        font-size: 1.3rem;
    }
    
    .filters {
        margin-top: -1.5rem;
    }
}
/* ===== Share Button ===== */
.btn-share {
    background: #25D366;
    color: white;
    border: none;
}

.btn-share:active {
    background: #128C7E;
    transform: scale(0.97);
}

.btn-share-social {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.btn-share-social:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* تنظیم مجدد فوتر کارت برای جایگیری ۳ دکمه */
.project-footer {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.project-footer .btn {
    flex: 1;
    min-width: 80px;
}

@media (max-width: 480px) {
    .project-footer .btn {
        font-size: 0.75rem;
        padding: 0.6rem 0.4rem;
    }
}