/* Top Navigation */
.top-nav {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.92);
}
.nav-inner {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}
.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}
.nav-logo { height: 26px; width: auto; }
.nav-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-primary);
    letter-spacing: -0.01em;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}
.nav-link {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
}
.nav-link:hover {
    background: var(--color-surface);
    color: var(--color-text);
}
.nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
    background: var(--color-primary-light);
}
.nav-user {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    padding: 0 var(--space-sm);
}

/* Hamburger — hidden on desktop */
.nav-hamburger { display: none; }

/* Main Content */
.main-content {
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
}

/* Page Header */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-xl);
    gap: var(--space-lg);
}
.page-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

/* Grid */
.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-user { display: none; }
    .nav-links { gap: 4px; }
    .nav-link { font-size: 0.75rem; padding: 4px 8px; }
    .nav-logo { height: 22px; }
}
/* ── Mobile — Phone layout (iPhone 14 = 390×844) ── */
@media (max-width: 640px) {
    /* Grid collapse */
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

    /* Tighter content padding */
    .main-content { padding: var(--space-md) var(--space-sm); }

    /* Nav bar */
    .nav-inner {
        padding: 0 var(--space-sm);
        height: 48px;
        position: relative;
    }
    .nav-brand { gap: 6px; }
    .nav-logo { height: 20px; }

    /* Hamburger — show on mobile */
    .nav-hamburger {
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 10px;
        -webkit-tap-highlight-color: transparent;
    }
    .nav-hamburger span {
        display: block;
        width: 20px;
        height: 2px;
        background: var(--color-text);
        border-radius: 1px;
        transition: all 0.3s var(--ease-out);
        transform-origin: center;
    }
    .nav-hamburger.open span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }
    .nav-hamburger.open span:nth-child(2) {
        opacity: 0;
        transform: scaleX(0);
    }
    .nav-hamburger.open span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }

    /* Nav links — dropdown menu on mobile */
    .nav-links {
        display: none;
        position: absolute;
        top: 48px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-xs) var(--space-sm);
        box-shadow: var(--shadow-lg);
        z-index: 100;
        gap: 0;
    }
    .nav-links.mobile-open {
        display: flex;
    }
    .nav-link {
        font-size: 0.88rem;
        padding: 14px var(--space-md);
        border-radius: var(--radius-md);
        white-space: nowrap;
    }
    .nav-link:active {
        background: var(--color-surface);
    }
    .nav-user {
        display: block;
        padding: var(--space-sm) var(--space-md);
        font-size: 0.75rem;
        color: var(--color-text-tertiary);
        border-top: 1px solid var(--color-border-light);
        margin-top: var(--space-xs);
    }
    .nav-links .btn {
        margin: var(--space-xs) var(--space-md) var(--space-sm);
        justify-content: center;
    }

    /* Page header stacks */
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    .page-title { font-size: 1.2rem; }

    /* Touch-friendly small buttons */
    .btn.btn-sm { font-size: 0.78rem; padding: 8px 12px; min-height: 36px; }
}

/* Login Page */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--color-bg-page);
}
.login-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl) var(--space-xl);
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
}
.login-logo {
    height: 36px;
    margin: 0 auto var(--space-lg);
}
.login-title {
    text-align: center;
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.01em;
}