/* ============================================================
   SUKOON DESIGN SYSTEM — shell.css
   Single source of truth for layout, typography, colors, nav.
   Every page imports this. Page-specific styles stay inline.
   ============================================================ */

/* ===================== TOKENS ===================== */
:root {
    /* Colors */
    --color-bg:        #FAFAF7;
    --color-text:      #1D1D1F;
    --color-text-sec:  #6E6E73;
    --color-text-tert: #AEAEB2;
    --color-accent:    #2D6A4F;
    --color-accent-bg: rgba(45,106,79,0.06);
    --color-accent-border: rgba(45,106,79,0.15);
    --color-surface:   #FFFFFF;
    --color-divider:   rgba(0,0,0,0.06);
    --color-hover:     rgba(0,0,0,0.03);

    /* Typography */
    --font-body:  -apple-system, 'Inter', BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-brand: 'DM Serif Display', Georgia, serif;
    --font-hindi: 'Noto Sans Devanagari', sans-serif;

    /* Layout */
    --topbar-h:    52px;
    --nav-h:       56px;
    --sidebar-w:   220px;
    --content-max: 720px;
    --radius-sm:   8px;
    --radius-md:   12px;
    --radius-lg:   16px;
    --radius-xl:   20px;

    /* Shadows */
    --shadow-sm:   0 1px 3px rgba(0,0,0,0.06);
    --shadow-md:   0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg:   0 8px 32px rgba(0,0,0,0.1);

    /* Transitions */
    --ease-out:    cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --dur-fast:    0.15s;
    --dur-med:     0.25s;
    --dur-slow:    0.4s;
}

/* ===================== RESET ===================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    padding-bottom: calc(var(--nav-h) + 16px);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { font-family: var(--font-body); }

/* ===================== TOPBAR ===================== */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 1.25rem;
    height: var(--topbar-h);
    background: rgba(250,250,247,0.85);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid var(--color-divider);
}

.topbar-brand {
    font-family: var(--font-brand);
    font-size: 1.25rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 6px;
}

.topbar-brand .brand-leaf {
    color: var(--color-accent);
    margin-right: 2px;
}

/* Also support .top-header alias for pages that use it */
.top-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    height: var(--topbar-h);
    background: rgba(250,250,247,0.85);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid var(--color-divider);
}

.top-header .brand {
    font-family: var(--font-brand);
    font-size: 1.25rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.top-header .brand-leaf {
    color: var(--color-accent);
    margin-right: 2px;
}

/* ===================== LANGUAGE PICKER ===================== */
.lang-picker,
.lang-select {
    padding: 5px 26px 5px 10px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(0,0,0,0.1);
    background: var(--color-surface);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-tert);
    cursor: pointer;
    font-family: var(--font-body);
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2386868B' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    outline: none;
    transition: border-color var(--dur-fast);
}

.lang-picker:hover,
.lang-select:hover { border-color: rgba(45,106,79,0.4); }
.lang-picker:focus,
.lang-select:focus { border-color: var(--color-accent); }

/* ===================== BOTTOM NAV (mobile) ===================== */
.bottom-nav {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    height: var(--nav-h);
    z-index: 1000;
    background: var(--color-surface);
    border-top: 1px solid var(--color-divider);
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding-bottom: env(safe-area-inset-bottom);
}

.bottom-nav a {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--color-text-tert);
    transition: color var(--dur-fast);
    -webkit-tap-highlight-color: transparent;
}

.bottom-nav a:hover { color: #86868B; }
.bottom-nav a.active { color: var(--color-accent); }

.bottom-nav svg {
    width: 22px; height: 22px;
    stroke-width: 1.5;
    fill: none;
    stroke: currentColor;
}

/* ===================== DESKTOP SIDEBAR >960px ===================== */
@media (min-width: 961px) {
    .bottom-nav {
        position: fixed;
        top: var(--topbar-h);
        left: 0; bottom: 0; right: auto;
        width: var(--sidebar-w);
        height: auto;
        flex-direction: column;
        justify-content: flex-start;
        padding: 24px 0;
        gap: 2px;
        border-top: none;
        border-right: 1px solid var(--color-divider);
        background: var(--color-surface);
    }

    .bottom-nav a {
        flex-direction: row;
        gap: 10px;
        width: 100%;
        padding: 10px 24px;
        font-size: 0.82rem;
        border-radius: 0;
    }

    .bottom-nav a.active {
        background: var(--color-accent-bg);
        border-right: 2px solid var(--color-accent);
    }

    body {
        padding-left: var(--sidebar-w);
        padding-bottom: 0;
    }

    .topbar,
    .top-header { left: var(--sidebar-w); }
}

/* ===================== COMMON ANIMATIONS ===================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.stagger-1 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.05s; }
.stagger-2 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.10s; }
.stagger-3 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.15s; }
.stagger-4 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.20s; }
.stagger-5 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.25s; }
.stagger-6 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.30s; }
.stagger-7 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.35s; }
.stagger-8 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.40s; }
.stagger-9 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.45s; }
.stagger-10 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.50s; }
.stagger-11 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.55s; }
.stagger-12 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.60s; }
.stagger-13 { animation: fadeSlideUp var(--dur-slow) var(--ease-out) both 0.65s; }

/* ===================== COMMON PAGE LAYOUT ===================== */
.page-container {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: calc(var(--topbar-h) + 24px) 20px 40px;
}

/* ===================== COMMON CARD STYLES ===================== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-divider);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: transform var(--dur-fast), box-shadow var(--dur-med);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================== COMMON BUTTON ===================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--color-accent);
    color: #FFFFFF;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all var(--dur-fast);
}

.btn-primary:hover {
    background: #245A42;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(45,106,79,0.25);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    background: var(--color-accent-bg);
    color: var(--color-accent);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all var(--dur-fast);
}

.btn-secondary:hover {
    background: rgba(45,106,79,0.12);
}

/* ===================== PILL TABS ===================== */
.pill-tabs {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 2px;
}
.pill-tabs::-webkit-scrollbar { display: none; }

.pill-tab {
    padding: 8px 18px;
    border-radius: 100px;
    border: 1px solid var(--color-divider);
    background: var(--color-surface);
    color: var(--color-text-sec);
    font-size: 0.82rem;
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--dur-fast);
}

.pill-tab:hover { border-color: rgba(45,106,79,0.3); }

.pill-tab.active {
    background: var(--color-accent);
    color: #FFFFFF;
    border-color: var(--color-accent);
}

/* ===================== SECTION HEADERS ===================== */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.section-header h2 {
    font-family: var(--font-brand);
    font-size: 1.3rem;
    color: var(--color-text);
    font-weight: 400;
}

.section-header a {
    font-size: 0.8rem;
    color: var(--color-accent);
    font-weight: 500;
}

/* ===================== PRIVACY NOTICE ===================== */
.privacy-notice {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--color-accent-bg);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
}

.privacy-notice svg { flex-shrink: 0; color: var(--color-accent); }

.privacy-notice p {
    font-size: 0.84rem;
    color: var(--color-text-sec);
    line-height: 1.5;
}

.privacy-notice .hi {
    font-family: var(--font-hindi);
    font-size: 0.78rem;
    color: var(--color-text-tert);
    display: block;
    margin-top: 2px;
}

/* ===================== SCROLLBAR ===================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.2); }

/* ===================== UTILITY ===================== */
.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

.text-accent { color: var(--color-accent); }
.text-sec { color: var(--color-text-sec); }
.text-tert { color: var(--color-text-tert); }
.font-brand { font-family: var(--font-brand); }