:root {
    --primary: #274496;
    --primary-600: #1d3575;
    --primary-700: #172b60;
    --primary-50: #eef2ff;

    --secondary: #fbd037;
    --secondary-600: #e6b82e;

    --light: #f8f9fa;
    --dark: #231f20;
    --gray: #6c757d;
    --light-gray: #e9ecef;

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

    --success: #10b981;
    --error: #dc2626;

    --radius-sm: 10px;
    --radius: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 16px 40px rgba(15, 23, 42, 0.10);
    --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.14);

    --transition: all 0.22s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Sora', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background:
        radial-gradient(circle at top, rgba(39, 68, 150, 0.04), transparent 30%),
        linear-gradient(180deg, #f8fafc 0%, #f5f7fb 100%);
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
}

button,
input,
select,
textarea {
    font: inherit;
}

.container {
    width: min(1200px, 92vw);
    margin: 0 auto;
    padding: 24px 0;
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.04);
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
}

.logo img {
    width: 260px;
    height: auto;
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 600;
    padding: 10px 14px;
    border-radius: 12px;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-links a:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.nav-links a.active {
    color: var(--primary);
    background: var(--primary-50);
    font-weight: 700;
}

.header-btns {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn {
    padding: 11px 18px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    line-height: 1.2;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 6px 20px rgba(39, 68, 150, 0.22);
}

.btn-primary:hover {
    background: var(--primary-600);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(39, 68, 150, 0.28);
}

.btn-secondary {
    background: var(--secondary);
    color: #111827;
    box-shadow: 0 6px 20px rgba(251, 208, 55, 0.24);
}

.btn-secondary:hover {
    background: var(--secondary-600);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(251, 208, 55, 0.3);
}

/* Main Content */
.announcement-header {
    text-align: center;
    margin-bottom: 34px;
    padding-top: 16px;
}

.announcement-header h1 {
    color: var(--gray-900);
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.08;
    margin-bottom: 14px;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.announcement-header p {
    color: var(--gray-500);
    font-size: clamp(1rem, 1.8vw, 1.12rem);
    max-width: 760px;
    margin: 0 auto;
}

.announcement-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 28px;
    box-shadow: var(--shadow-lg);
    padding: 34px;
    margin-bottom: 50px;
    border: 1px solid rgba(229, 231, 235, 0.9);
    backdrop-filter: blur(12px);
}

/* Form sections */
.form-section {
    margin-bottom: 38px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--gray-200);
}

.form-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.form-section h2 {
    color: var(--gray-900);
    margin-bottom: 22px;
    font-size: clamp(1.2rem, 2vw, 1.55rem);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.form-section h2 i {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-50), #dbe7ff);
    color: var(--primary);
    font-size: 1rem;
    flex-shrink: 0;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 8px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--gray-700);
    font-size: 0.92rem;
    letter-spacing: 0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 13px 15px;
    border: 1.5px solid var(--gray-200);
    border-radius: 14px;
    font-size: 0.98rem;
    background: #fff;
    color: var(--gray-800);
    transition: var(--transition);
    outline: none;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.02);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(39, 68, 150, 0.10);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.6;
}

/* Image Upload */
.image-upload-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 28px;
    align-items: start;
}

.upload-instructions {
    background: linear-gradient(180deg, #f8fbff 0%, #eef4ff 100%);
    padding: 22px;
    border-radius: 20px;
    border: 1px solid #dbe7ff;
    box-shadow: var(--shadow-sm);
}

.upload-instructions p {
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.upload-instructions ul {
    padding-left: 20px;
    color: var(--gray-600);
}

.upload-instructions li {
    margin-bottom: 10px;
    line-height: 1.55;
}

.upload-area {
    border: 2px dashed #c7d3ea;
    border-radius: 24px;
    padding: 34px 26px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
    box-shadow: var(--shadow-sm);
}

.upload-area:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.upload-area i {
    font-size: 2.7rem;
    color: var(--primary);
    margin-bottom: 14px;
}

.upload-area p {
    margin-bottom: 14px;
    color: var(--gray-500);
    font-size: 0.98rem;
}

.upload-area .btn {
    margin-top: 6px;
}

.upload-area.highlight {
    border-color: var(--primary);
    background: rgba(39, 68, 150, 0.05);
    box-shadow: 0 0 0 4px rgba(39, 68, 150, 0.08);
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
    margin-top: 22px;
}

.preview-tools {
    margin-top: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.selected-images-count {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--gray-600);
}

.btn-remove-all {
    background: #fff5f5;
    color: #b91c1c;
    border: 1px solid #fecaca;
    box-shadow: none;
    padding: 9px 14px;
}

.btn-remove-all:hover {
    background: #fee2e2;
    color: #991b1b;
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(220, 38, 38, 0.16);
}

.preview-item {
    position: relative;
    height: 160px;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    background: #fff;
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-image {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 30px;
    height: 30px;
    background: rgba(17, 24, 39, 0.82);
    color: white;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.18);
}

.remove-image:hover {
    background: var(--error);
    transform: scale(1.06);
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 14px;
    margin-top: 34px;
    padding-top: 8px;
    flex-wrap: wrap;
}

.form-actions .btn {
    min-width: 170px;
    padding: 13px 18px;
    border-radius: 14px;
}

/* Footer */
footer {
    background: linear-gradient(180deg, #111827 0%, #0b1221 100%);
    color: white;
    padding: 56px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 30px;
    margin-bottom: 36px;
}

.footer-column h3 {
    color: var(--secondary);
    margin-bottom: 18px;
    font-size: 1.05rem;
    font-weight: 800;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #94a3b8;
}

.footer-column ul li a {
    color: #94a3b8;
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: white;
}

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 18px;
    flex-wrap: wrap;
}

.social-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background-color: #1e2d40;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: white;
    text-decoration: none;
}

.social-icon:hover {
    background-color: var(--secondary);
    color: var(--dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(251, 208, 55, 0.24);
}

.social-icon i {
    font-size: 18px;
}

.footer-bottom {
    border-top: 1px solid #243244;
    padding-top: 20px;
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .image-upload-container {
        grid-template-columns: 1fr;
    }

    .announcement-container {
        padding: 26px;
    }
}

@media (max-width: 768px) {
    .container {
        width: min(1200px, 94vw);
        padding: 18px 0;
    }

    .header-container {
        flex-direction: column;
        gap: 14px;
    }

    .logo img {
        width: 190px;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .announcement-header {
        margin-bottom: 24px;
    }

    .announcement-header h1 {
        font-size: 2rem;
    }

    .announcement-container {
        border-radius: 22px;
        padding: 20px 18px;
    }

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

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

    .btn,
    .form-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .announcement-header h1 {
        font-size: 1.75rem;
    }

    .announcement-header p {
        font-size: 0.98rem;
    }

    .form-section h2 {
        align-items: flex-start;
    }

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

    .upload-area {
        padding: 28px 18px;
    }
}

/* Focus */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(39, 68, 150, 0.24);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}