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

:root {
    /* Primary colors */
    --color-fun-green: #007C3E;
    --color-white: #FFFFFF;
    --color-black: #000000;

    /* Grayscale */
    --color-gray-alto: #D2D2D2;
    --color-gray: #8E8E8E;
    --color-gray-mine-shaft: #4A4A4A;

    /* Secondary colors */
    --color-green-pea: #1D5632;
    --color-apple: #4E9D2D;
    --color-conifer: #A4D55D;
    --color-yellow-green: #D4EB8D;

    /* Special */
    --color-stripe-green-2023: #1BA741;

    /* Utility */
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #E5E5E5;
    --gray-300: #D4D4D4;
    --gray-500: #737373;
    --gray-700: #404040;
    --gray-900: #171717;
    --red: #dc2626;
    --amber: #f59e0b;
    --blue: #3b82f6;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, system-ui, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
    min-height: 100vh;
}

/* ===== HEADER ===== */
.header {
    background: var(--color-green-pea);
    color: var(--color-white);
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
    box-shadow: 0 2px 8px rgba(0,0,0,.15);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-white);
}

.header-brand img {
    height: 40px;
    width: 40px;
}

.header-brand h1,
.header h1 {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.header .user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header .user-info span {
    opacity: 0.9;
    font-size: 0.9rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn:hover { transform: translateY(-1px); box-shadow: 0 2px 8px rgba(0,0,0,.15); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--color-fun-green); color: var(--color-white); }
.btn-primary:hover { background: var(--color-green-pea); }
.btn-danger { background: var(--red); color: var(--color-white); }
.btn-secondary { background: var(--gray-200); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-300); }
.btn-amber { background: var(--amber); color: var(--color-white); }
.btn-blue { background: var(--blue); color: var(--color-white); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.75rem; }
.btn-lg { padding: 0.8rem 2rem; font-size: 1rem; }

.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ===== LAYOUT ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

/* ===== CARDS ===== */
.card {
    background: var(--color-white);
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--gray-200);
}

.card h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--color-fun-green);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

/* ===== FORMS ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.3rem;
    font-size: 0.85rem;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 2px solid var(--gray-200);
    border-radius: 4px;
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-group textarea { min-height: 80px; resize: vertical; }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-fun-green);
    box-shadow: 0 0 0 3px rgba(0,124,62,.1);
}

/* ===== TABLES ===== */
table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--gray-200);
    font-size: 0.9rem;
}

th {
    font-weight: 700;
    color: var(--gray-500);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

tr:hover { background: var(--gray-50); }

/* ===== TABS ===== */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 3px solid var(--gray-200);
    margin-bottom: 1.5rem;
}

.tab {
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    font-weight: 700;
    color: var(--gray-500);
    border-bottom: 3px solid transparent;
    margin-bottom: -3px;
    transition: all 0.15s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.85rem;
}

.tab:hover { color: var(--color-fun-green); }
.tab.active { color: var(--color-fun-green); border-bottom-color: var(--color-fun-green); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== LOGIN / REGISTER ===== */
#login-screen,
#register-screen {
    min-height: 100vh;
    background: var(--color-green-pea);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    max-width: 420px;
    width: 100%;
    padding: 1rem;
}

.login-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
}

.login-brand img {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
}

.login-brand h1 {
    color: var(--color-white);
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.login-brand .login-subtitle {
    color: var(--color-conifer);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 0.25rem;
}

.login-container .card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0,0,0,.2);
}

/* ===== ALERTS ===== */
.alert {
    padding: 0.8rem 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.alert-error { background: #fef2f2; color: var(--red); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--color-green-pea); border: 1px solid #bbf7d0; }
.alert-info { background: #eff6ff; color: var(--blue); border: 1px solid #bfdbfe; }

/* ===== BADGES ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-green { background: #dcfce7; color: var(--color-green-pea); }
.badge-amber { background: #fef3c7; color: #92400e; }
.badge-red { background: #fef2f2; color: var(--red); }
.badge-blue { background: #dbeafe; color: #1e40af; }
.badge-gray { background: var(--gray-200); color: var(--gray-700); }

/* ===== SESSION CODE ===== */
.session-code {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 0.3rem;
    color: var(--color-fun-green);
    font-family: 'Courier New', monospace;
}

/* ===== PLAYER LIST ===== */
.player-list {
    list-style: none;
}

.player-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--gray-100);
}

.player-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.5rem;
}

.player-status.online { background: var(--color-stripe-green-2023); }
.player-status.offline { background: var(--gray-300); }

/* ===== PROGRESS BAR ===== */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    overflow: hidden;
    margin: 0.5rem 0;
}

.progress-bar .fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-fun-green), var(--color-stripe-green-2023));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* ===== MODAL ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--color-white);
    border-radius: 8px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
}

.modal h2 { margin-bottom: 1rem; }

.modal-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

/* ===== GAME CONTROL ===== */
.game-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.phase-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--color-stripe-green-2023);
    color: white;
    border-radius: 3px;
    font-weight: 800;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.score-table td:last-child {
    font-weight: 700;
    color: var(--color-fun-green);
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .grid-2 { grid-template-columns: 1fr; }
    .container { padding: 1rem; }
    .header { padding: 0 1rem; }
}