/* =========================================
   BUTTONS
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    font-size: 18px;
    font-weight: 700;
    border-radius: var(--radius-btn);
    cursor: pointer;
    gap: 10px;
    border: 2px solid transparent;
    transition:
        opacity 0.1s,
        all 0.3s ease-in-out;
    text-align: center;
}

.btn-primary {
    background: var(--color-brand);
    color: var(--color-text-on-brand);
    box-shadow: 0 10px 25px rgba(var(--color-brand-rgb), 0.3);
}

.btn-primary:hover {
    transform: scale(1.05);
    background: rgba(var(--color-brand-rgb), 0.15);
    color: var(--color-brand);
    border-color: var(--color-brand);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover {
    transform: scale(1.05);
    border-color: var(--color-text-main);
    background: var(--color-card-bg);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

/* =========================================
   HEADER
   ========================================= */
.header {
    height: 80px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-card);
    transition:
        background-color 0.4s ease,
        border-color 0.4s ease;
    backdrop-filter: blur(10px);
    background: var(--color-bg);
}

[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.95);
}
[data-theme="dark"] .header {
    background: rgba(18, 18, 19, 0.9);
}

.header-container {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    font-size: 26px;
    font-weight: 800;
    color: var(--color-brand);
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: color 0.4s ease;
}

.logo-box {
    width: 32px;
    height: 32px;
    background: var(--color-brand);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: background-color 0.4s ease;
}
.logo span {
    padding-bottom: 2px;
    position: relative;
    display: block;
    line-height: 1;
}
.logo span::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-brand);
    border-radius: 2px;
    transition: background-color 0.4s ease;
}

/* Nav */
.nav {
    display: flex;
    gap: 32px;
}
.nav a {
    color: var(--color-text-light);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s var(--ease-smooth);
}
.nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--color-brand);
    transition:
        width 0.8s var(--ease-smooth),
        background-color 0.4s ease;
}
.nav a:hover {
    color: var(--color-brand);
}
.nav a:hover::after {
    width: 100%;
}
.nav a svg {
    width: 18px;
    height: 18px;
    opacity: 0.8;
    stroke: currentColor;
}

/* Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-btn {
    background: transparent;
    border: 2px solid var(--border-btn-secondary);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-main);
    transition:
        opacity 0.1s,
        all 0.3s ease-in-out;
}
.theme-btn:hover {
    transform: scale(1.05);
    background: rgba(var(--color-brand-rgb), 0.15);
    color: var(--color-brand);
    border-color: var(--color-brand);
    box-shadow: var(--shadow-glow);
}
.theme-btn svg {
    width: 20px;
    height: 20px;
    transition: transform 0.5s var(--ease-smooth);
}
.theme-btn .icon-moon {
    display: none;
}
.theme-btn .icon-sun {
    display: block;
}
[data-theme="dark"] .theme-btn .icon-moon {
    display: block;
}
[data-theme="dark"] .theme-btn .icon-sun {
    display: none;
}

.auth-btn {
    padding: 10px 24px;
    background: var(--color-brand);
    color: var(--color-text-on-brand);
    border-radius: var(--radius-btn);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 2px solid transparent;
    transition:
        opacity 0.1s,
        all 0.3s ease-in-out;
}
.auth-btn:hover {
    background: rgba(var(--color-brand-rgb), 0.15);
    color: var(--color-brand);
    border-color: var(--color-brand);
    box-shadow: 0 4px 20px rgba(var(--color-brand-rgb), 0.3);
    transform: scale(1.05);
}

/* Mobile Header */
@media (max-width: 960px) {
    .header {
        height: 70px;
    }
    .nav {
        display: none;
    }
    .auth-btn span {
        display: none;
    }
    .auth-btn {
        padding: 10px;
    }
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
    padding: 80px 0 40px;
    background: var(--color-bg-light);
    border-top: 1px solid var(--border-card);
    margin-top: 60px;
}
.footer-content {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 60px;
    align-items: start;
    margin-bottom: 40px;
}
.footer-brand {
    max-width: 320px;
}
.footer-brand p {
    color: var(--color-text-light);
    font-size: 14px;
    margin-top: 16px;
    line-height: 1.6;
}
.footer-links-grid {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 700px;
    margin-left: auto;
}
.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 20px;
}
.footer-col ul li {
    margin-bottom: 12px;
}
.footer-col ul li a {
    color: var(--color-text-light);
    font-size: 14px;
    transition: color 0.2s;
}
.footer-col ul li a:hover {
    color: var(--color-brand);
}
.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-card);
    color: var(--color-text-light);
    font-size: 13px;
}

@media (max-width: 960px) {
    .footer {
        padding: 40px 0 20px;
    }
    .footer-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 40px;
    }
    .footer-links-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
        margin-left: 0;
        width: 100%;
        justify-items: center;
        text-align: center;
    }
    .footer-links-grid .footer-col:last-child {
        grid-column: span 2;
    }
}