/* ============================================================
   MAIN.CSS — Core design system (optimised, GPU-composited)
   ============================================================ */

/* Dark mode flash prevention — must be first */
html { color-scheme: light dark; }

:root {
    --primary: #4f46e5; --primary-hover: #4338ca; --primary-soft: rgba(79,70,229,0.12);
    --btn-bg: linear-gradient(135deg, #4f46e5 0%, #7c6df0 100%);
    --bg-color: #eef1f8;
    --bg-gradient: radial-gradient(circle at 12% 0%, rgba(224,231,255,0.9) 0%, rgba(224,231,255,0) 42%),
                   radial-gradient(circle at 100% 15%, rgba(243,232,255,0.85) 0%, rgba(243,232,255,0) 40%),
                   linear-gradient(160deg, #f6f8fd 0%, #eceff8 55%, #e8ecf7 100%);
    --card-bg: rgba(255,255,255,0.72);
    --card-bg-solid: #ffffff;
    --surface-tint: #f3f4fb;
    --input-bg: rgba(255,255,255,0.65);
    --text-main: #1c2033; --text-muted: #626a80;
    --border: rgba(30,41,59,0.15); --border-focus: #a5b4fc;
    --success: #059669; --success-bg: #e7f9f1;
    --danger: #e11d48; --danger-bg: #fdeef1;
    --warning: #d97706; --warning-bg: #fff8e8;
    --purple: #7c3aed; --purple-bg: #f4f0ff;
    --shadow-sm: 0 1px 3px rgba(30,41,86,0.06);
    --shadow-md: 0 8px 24px -6px rgba(45,55,120,0.18), 0 2px 8px -2px rgba(45,55,120,0.06);
    --shadow-hover: 0 16px 36px -10px rgba(45,55,120,0.26), 0 4px 12px -4px rgba(45,55,120,0.1);
    --shadow-modal: 0 24px 48px -12px rgba(35,40,90,0.32), 0 8px 20px -6px rgba(35,40,90,0.12);
    --shadow-navbar: 0 6px 20px -4px rgba(45,35,120,0.32);
    --input-locked-bg: rgba(241,245,255,0.7);
    --radius-card: 1rem; --radius-input: 0.65rem; --radius-btn: 0.6rem; --radius-modal: 1.25rem;
    --glass-blur: 0px; --border-w: 1px; --card-pad: 1.25rem;
    --scrollbar-thumb: #a5aee0;
    --navbar-bg: linear-gradient(120deg, #3730a3 0%, #4f46e5 45%, #7c3aed 100%);
    --navbar-text: rgba(255,255,255,0.8);
    --navbar-active-bg: rgba(255,255,255,0.18);
    --rf-border: rgba(28,32,51,0.5);
    /* Performance: hint GPU for animated elements */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: #8891cc; }

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

body {
    font-family: 'Roboto', 'Inter', 'Segoe UI', system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* No transition on body — eliminates FOUC on theme switch */
}

/* ── Navbar ── */
.navbar {
    background: var(--navbar-bg);
    color: white;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-navbar);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    min-height: 56px;
    flex-shrink: 0;
    gap: 0.3rem;
    overflow-x: auto;
    /* GPU layer for smooth scroll */
    will-change: auto;
    scrollbar-width: none;
}
.navbar::-webkit-scrollbar { display: none; }
.nav-section { display: flex; align-items: center; gap: 0.25rem; }
.nav-divider { width: 1px; height: 24px; background: linear-gradient(rgba(255,255,255,0), rgba(255,255,255,0.2), rgba(255,255,255,0)); margin: 0 0.5rem; align-self: center; flex-shrink: 0; }
.nav-label { font-size: 0.62rem; font-weight: 700; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap; align-self: center; flex-shrink: 0; margin-right: 0.1rem; }
.nav-link {
    position: relative; color: rgba(255,255,255,0.72); text-decoration: none; font-weight: 600;
    padding: 0.42rem 0.65rem; border-radius: 0.55rem; cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
    font-size: 0.72rem; letter-spacing: 0.01em; white-space: nowrap;
    display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 0.18rem; border: 1px solid transparent; min-width: 64px; line-height: 1.2; flex-shrink: 0;
    /* GPU hint for transform */
    will-change: transform;
}
.nav-link:hover { background-color: rgba(255,255,255,0.1); color: #fff; transform: translateY(-1px); }
.nav-link:active { transform: translateY(0); }
.nav-link.active { background-color: rgba(255,255,255,0.18); color: #fff; border-color: rgba(255,255,255,0.3); }
.nav-link.active::after { content: ''; position: absolute; left: 20%; right: 20%; bottom: -1px; height: 2px; border-radius: 2px; background: rgba(255,255,255,0.9); }
.nav-link.cash-btn.active { background-color: rgba(22,163,74,0.2); color: #86efac; border-color: rgba(22,163,74,0.5); }
.nav-link.cash-btn.active::after { background: #4ade80; }
.nav-link.bank-btn.active { background-color: rgba(59,130,246,0.2); color: #93c5fd; border-color: rgba(59,130,246,0.5); }
.nav-link.bank-btn.active::after { background: #60a5fa; }
.nav-link.report-btn.active { background: rgba(124,58,237,0.22); color: #ddd6fe; border-color: rgba(124,58,237,0.5); }
.nav-link.report-btn.active::after { background: var(--purple); }
.nav-link.ledger-static.active { background: rgba(148,163,184,0.18); color: #e2e8f0; border-color: rgba(148,163,184,0.35); }
.nav-link.ledger-static.active::after { background: #94a3b8; }
.theme-toggle-btn {
    background: transparent; border: 1px solid rgba(255,255,255,0.15); padding: 0.45rem;
    width: 34px; height: 34px; border-radius: 50%; color: rgba(255,255,255,0.8); cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    flex-shrink: 0; will-change: transform;
}
.theme-toggle-btn:hover { background: rgba(255,255,255,0.12); color: #fff; transform: translateY(-1px); }
.nav-link:focus-visible, .theme-toggle-btn:focus-visible { outline: 2px solid #60a5fa; outline-offset: 2px; }
.ml-auto { margin-left: auto; }
.navbar.collapsed .nav-link:not(.active), .navbar.collapsed .nav-label, .navbar.collapsed .nav-divider { display: none; }

/* ── Layout ── */
.container { padding: 1.25rem 1.75rem; flex: 1; overflow-y: auto; overflow-x: hidden; }
.page { display: none; animation: fadeIn 0.18s ease; }
.page.active { display: block; }
#calendarPage.active { display: flex; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: translateY(0); } }

/* ── Buttons ── */
.btn {
    padding: 0.5rem 1rem; border: none; border-radius: var(--radius-btn); cursor: pointer;
    font-weight: 700; background: var(--btn-bg); color: white;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
    display: inline-flex; align-items: center; gap: 0.38rem; font-size: 0.83rem;
    box-shadow: var(--shadow-sm); height: 40px;
    will-change: transform;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
.btn-outline { background: transparent; border: 1px solid var(--border-focus); color: var(--text-main); box-shadow: none; }
.btn-outline:hover { background: var(--surface-tint); }
.btn-danger-outline { background: transparent; border: 1px solid var(--danger); color: var(--danger); }
.btn-danger-outline:hover { background: var(--danger-bg); }
.btn-success { background: var(--success); }
.btn-success:hover { background: #15803d; }
.btn-purple { background: var(--purple); }
.btn-purple:hover { background: #6d28d9; }
.btn-secondary { background: #475569; }
.btn-secondary:hover { background: #334155; }
.btn-primary { background: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-icon-only { padding: 0; width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center; border-radius: var(--radius-btn); flex-shrink: 0; }
.icon-btn { background: transparent; border: none; cursor: pointer; color: var(--text-muted); padding: 0.3rem; border-radius: 0.4rem; transition: background-color var(--transition-fast), color var(--transition-fast); display: inline-flex; align-items: center; justify-content: center; }
.icon-btn:hover { background: rgba(0,0,0,0.06); color: var(--text-main); }
.icon-btn.edit:hover { color: var(--primary); background: var(--primary-soft); }
.icon-btn.statement:hover { color: #10b981; background: rgba(16,185,129,0.1); }
.icon-btn.delete:hover { color: var(--danger); background: var(--danger-bg); }
.icon-btn svg { width: 1.05rem; height: 1.05rem; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ── Forms ── */
.form-group { display: flex; flex-direction: column; gap: 0.25rem; position: relative; }
.form-group label { font-size: 0.68rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.07em; }
.input-field {
    padding: 0.5rem 0.7rem; border: var(--border-w) solid var(--border); border-radius: var(--radius-input);
    font-size: 0.86rem; outline: none; background: var(--input-bg); width: 100%; color: var(--text-main); height: 40px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input-field:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.input-with-icon { position: relative; display: flex; align-items: center; }
.input-with-icon svg { position: absolute; left: 0.6rem; width: 0.95rem; height: 0.95rem; color: var(--text-muted); pointer-events: none; }
.input-with-icon input { padding-left: 2rem; }

/* ── Multi-select ── */
.multi-select-box { padding: 0.5rem 0.7rem; border: var(--border-w) solid var(--border); border-radius: var(--radius-input); font-size: 0.86rem; cursor: pointer; background: var(--input-bg); position: relative; min-height: 40px; display: flex; align-items: center; user-select: none; color: var(--text-main); transition: border-color var(--transition-fast); }
.multi-select-box:hover { border-color: var(--border-focus); }
.multi-select-options { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--card-bg-solid); border: var(--border-w) solid var(--border); border-radius: var(--radius-input); margin-top: 0.2rem; box-shadow: var(--shadow-md); z-index: 50; max-height: 280px; overflow-y: auto; }
.multi-select-options.show { display: block; }
.ms-search { padding: 0.45rem 0.55rem; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--card-bg-solid); z-index: 2; }
.ms-search input { width: 100%; padding: 0.38rem 0.5rem; border: 1px solid var(--border); border-radius: 0.35rem; outline: none; font-size: 0.8rem; background: transparent; color: var(--text-main); }
.ms-search input:focus { border-color: var(--primary); }
.ms-select-all { padding: 0.4rem 0.65rem; display: flex; align-items: center; gap: 0.45rem; cursor: pointer; border-bottom: 2px solid var(--border); font-size: 0.82rem; font-weight: 700; color: var(--text-main); background: var(--surface-tint); position: sticky; top: 38px; z-index: 2; }
.ms-select-all:hover { background: var(--primary-soft); }
.ms-option { display: flex; align-items: center; gap: 0.45rem; padding: 0.42rem 0.65rem; cursor: pointer; font-size: 0.83rem; transition: background-color var(--transition-fast); }
.ms-option:hover { background: var(--surface-tint); }
.ms-option input[type=checkbox] { accent-color: var(--primary); }

/* ── Tables ── */
.table-container { background: var(--card-bg); border: var(--border-w) solid var(--border); border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-sm); }
table { width: 100%; border-collapse: collapse; font-size: 0.83rem; }
th { background: var(--surface-tint); padding: 0.55rem 0.75rem; text-align: left; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); border-bottom: 2px solid var(--border); position: sticky; top: 0; z-index: 2; }
td { padding: 0.48rem 0.75rem; border-bottom: 1px solid var(--border); color: var(--text-main); }
tbody tr { transition: background-color var(--transition-fast); }
tbody tr:hover { background: var(--surface-tint); }
tbody tr:last-child td { border-bottom: none; }
.amount-col { text-align: right; font-variant-numeric: tabular-nums; font-weight: 700; }
.balance-col { text-align: right; font-variant-numeric: tabular-nums; font-weight: 800; background: var(--surface-tint); font-size: 0.84rem; }
.amt-success { color: var(--success); }
.amt-danger { color: var(--danger); }
.grp-badge { display: inline-block; font-size: 0.62rem; font-weight: 700; padding: 0.15rem 0.5rem; border-radius: 99px; text-transform: uppercase; letter-spacing: 0.04em; }
.grp-cash { color: var(--success); background: var(--success-bg); }
.grp-bank { color: var(--primary); background: var(--primary-soft); }
.grp-income { color: var(--warning); background: var(--warning-bg); }
.grp-expense { color: var(--danger); background: var(--danger-bg); }

/* ── Export bar ── */
.export-bar { display: flex; align-items: center; gap: 0.5rem; padding: 0.55rem 0.85rem; background: var(--surface-tint); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.export-period { font-size: 0.72rem; font-weight: 700; color: var(--text-muted); display: flex; align-items: center; gap: 0.3rem; margin-right: auto; }
.btn-export { display: inline-flex; align-items: center; gap: 0.3rem; padding: 0.3rem 0.7rem; border-radius: 0.4rem; border: 1px solid; font-size: 0.72rem; font-weight: 700; cursor: pointer; background: transparent; transition: background-color var(--transition-fast), transform var(--transition-fast); will-change: transform; }
.btn-export:hover { transform: translateY(-1px); }
.btn-excel { color: #16a34a; border-color: #86efac; background: rgba(22,163,74,0.07); }
.btn-excel:hover { background: rgba(22,163,74,0.14); }
.btn-pdf { color: #dc2626; border-color: #fca5a5; background: rgba(220,38,38,0.07); }
.btn-pdf:hover { background: rgba(220,38,38,0.14); }

/* ── Summary bar ── */
.summary-bar { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.6rem; margin-bottom: 1rem; }
.sum-card { background: var(--card-bg); border: var(--border-w) solid var(--border); border-radius: var(--radius-card); padding: 0.75rem 1rem; box-shadow: var(--shadow-sm); }
.sum-card.blue { border-left: 3px solid var(--primary); }
.sum-card.green { border-left: 3px solid var(--success); }
.sum-card.red { border-left: 3px solid var(--danger); }
.sum-card.purple { border-left: 3px solid var(--purple); }
.sum-card.amber { border-left: 3px solid var(--warning); }
.sum-card .label { font-size: 0.65rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.3rem; }
.sum-card .value { font-size: 1.1rem; font-weight: 800; font-variant-numeric: tabular-nums; }

/* ── Toast ── */
#toast {
    position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%) translateY(80px);
    background: #1e293b; color: #fff; padding: 0.65rem 1.25rem; border-radius: 0.6rem;
    font-size: 0.83rem; font-weight: 600; z-index: 99999; opacity: 0; pointer-events: none;
    transition: transform 0.22s ease, opacity 0.22s ease; max-width: 90vw; text-align: center;
    box-shadow: var(--shadow-md);
    will-change: transform, opacity;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast.toast-success { background: #065f46; }
#toast.toast-error { background: #9f1239; }
#toast.toast-info { background: #1e40af; }
#toast.toast-warning { background: #92400e; }

/* ── Global Loader ── */
#globalLoader {
    position: fixed; inset: 0; z-index: 99998; background: rgba(15,23,42,0.65);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
    backdrop-filter: blur(2px);
}
#globalLoader.active { opacity: 1; visibility: visible; }
.loader-card { background: var(--card-bg-solid); border-radius: 1rem; padding: 1.75rem 2rem; text-align: center; box-shadow: var(--shadow-modal); min-width: 220px; }
.loader-spinner { width: 36px; height: 36px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.7s linear infinite; margin: 0 auto 0.85rem; will-change: transform; }
@keyframes spin { to { transform: rotate(360deg); } }
.loader-label { font-size: 0.85rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.75rem; }
.loader-progress-track { height: 5px; background: var(--border); border-radius: 99px; overflow: hidden; margin-bottom: 0.4rem; }
.loader-progress-fill { height: 100%; background: var(--primary); border-radius: 99px; transition: width 0.3s ease; will-change: width; }

/* ── Pagination ── */
.pagination-container { display: flex; align-items: center; justify-content: center; gap: 1rem; padding: 0.75rem; border-top: 1px solid var(--border); }

/* ── Downloads banner ── */
#openDownloadsBanner { position: fixed; top: 0.75rem; left: 50%; transform: translateX(-50%); background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; padding: 0.6rem 1.25rem; border-radius: 0.5rem; z-index: 9999; box-shadow: var(--shadow-md); }
#openDownloadsBanner div { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 0.83rem; }

/* ── FY indicator ── */
.fy-indicator { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.03em; color: rgba(255,255,255,0.85); cursor: pointer; white-space: nowrap; padding: 0.35rem 0.6rem; margin-left: 0.3rem; border: 1px solid rgba(255,255,255,0.15); border-radius: 999px; user-select: none; transition: background-color var(--transition-fast), color var(--transition-fast); }
.fy-indicator:hover { background: rgba(255,255,255,0.1); color: #fff; }
.fy-indicator:focus-visible { outline: 2px solid #60a5fa; outline-offset: 2px; }