:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #10b981;
    --error: #ef4444;
    --font-size-base: 1.05rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    font-size: var(--font-size-base);
}

.container {
    max-width: 800px;
    width: 100%;
    animation: fadeIn 0.6s ease-out;
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
        padding: 0.5rem;
    }

    .glass-card {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.75rem;
    }
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

h1 {
    font-size: 2.25rem;
    margin-bottom: 0.75rem;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

p.subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
}

select,
textarea,
input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
}

select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

button {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.hint-box {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    padding: 1rem;
    border-radius: 12px;
    margin-top: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.hint-box strong {
    color: var(--primary);
    display: block;
    margin-bottom: 0.25rem;
}

.sidebar h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.project-list {
    list-style: none;
}

.project-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    padding: 1.25rem;
    border-radius: 12px;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.project-item:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.project-item.available:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.project-item.taken {
    opacity: 0.5;
    text-decoration: line-through;
    border-color: var(--error);
}

.status-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    text-transform: uppercase;
    font-weight: 700;
}

.status-badge.available {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent);
}

.status-badge.taken {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
}

.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

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

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

/* Premium Popup (Modal) Styles */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    animation: fadeInModal 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-content {
    max-width: 600px;
    width: 100%;
    max-height: 85vh;
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 32px;
    position: relative;
    padding: 3.5rem;
    overflow-y: auto;
    box-shadow: 0 50px 100px -20px rgba(0, 0, 0, 0.5);
    animation: popupScale 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.close-btn {
    position: absolute;
    top: 2rem;
    right: 2rem;
    width: 44px !important;
    height: 44px !important;
    background: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    border-radius: 50% !important;
    color: white !important;
    font-size: 1.5rem !important;
    cursor: pointer;
    display: flex !important;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    padding: 0 !important;
    margin: 0 !important;
}

.close-btn:hover {
    background: rgba(239, 68, 68, 0.2) !important;
    border-color: rgba(239, 68, 68, 0.5) !important;
    color: #ef4444 !important;
    transform: rotate(90deg) scale(1.1) !important;
}

.modal-content h2 {
    font-size: 2rem;
    margin-bottom: 2.5rem;
    padding-right: 3rem;
    color: white;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.3;
}

.detail-section {
    margin-bottom: 2.5rem;
    position: relative;
    padding-left: 1.5rem;
    border-left: 2px solid rgba(99, 102, 241, 0.3);
}

.detail-section:last-child {
    margin-bottom: 0;
}

.detail-section strong {
    display: block;
    color: #818cf8;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.detail-section p {
    color: #cbd5e1;
    line-height: 1.8;
    font-size: 1.1rem;
    font-weight: 400;
}

@keyframes fadeInModal {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

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

/* Custom Scrollbar for Modal */
.modal-content::-webkit-scrollbar {
    width: 6px;
}

.modal-content::-webkit-scrollbar-track {
    background: transparent;
}

.modal-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

@media (max-width: 600px) {
    .modal-content {
        padding: 2rem 1.5rem;
    }

    .detail-section p {
        font-size: 1rem;
    }
}