/* ============================================
   ICDS IV - Revenue Recognition
   Professional CSS with Premium Color Scheme
   ============================================ */

/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Professional Color Palette */
    --primary-dark: rgb(18, 31, 61);
    --primary-navy: rgb(26, 55, 107);
    --primary-blue: rgb(54, 111, 199);
    --accent-gold: rgb(255, 193, 7);
    --accent-light-blue: rgb(100, 181, 246);
    --accent-success: rgb(46, 125, 50);
    --accent-warning: rgb(245, 124, 0);
    --text-primary: rgb(245, 245, 245);
    --text-secondary: rgb(189, 189, 189);
    --border-primary: rgb(54, 111, 199);
    --border-secondary: rgb(100, 181, 246);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --gradient-start: rgb(18, 31, 61);
    --gradient-end: rgb(26, 55, 107);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 50%, var(--primary-dark) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.8;
    min-height: 100vh;
    font-weight: 600;
}

/* ==================== CONTAINER ==================== */
.container {
    max-width: 1400px;
    margin: 20px auto;
    padding: 0;
    background: rgba(18, 31, 61, 0.95);
    border: 4px solid var(--border-primary);
    border-radius: 16px;
    box-shadow: 0 15px 50px var(--shadow-color);
    overflow: hidden;
}

/* ==================== HEADER ==================== */
header {
    text-align: center;
    padding: 40px 30px;
    background: linear-gradient(135deg, rgb(26, 55, 107) 0%, rgb(18, 31, 61) 100%);
    border-bottom: 5px solid var(--accent-gold);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(54, 111, 199, 0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

header h1 {
    font-size: 3em;
    color: var(--accent-gold);
    text-shadow: 3px 3px 8px rgba(0, 0, 0, 0.8);
    margin-bottom: 15px;
    font-weight: 800;
    letter-spacing: 3px;
    position: relative;
    z-index: 1;
}

.disclaimer {
    font-size: 1em;
    color: var(--accent-light-blue);
    font-style: italic;
    margin-top: 15px;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

/* ==================== NAVIGATION ==================== */
.navigation {
    background: linear-gradient(135deg, rgb(26, 55, 107) 0%, rgb(18, 31, 61) 100%);
    padding: 30px;
    border-bottom: 3px solid var(--border-secondary);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.navigation h2 {
    color: var(--accent-gold);
    margin-bottom: 25px;
    font-size: 2em;
    text-align: center;
    font-weight: 800;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.7);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.nav-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, fr));
    gap: 15px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-buttons button {
    padding: 15px 25px;
    background: linear-gradient(135deg, rgb(54, 111, 199) 0%, rgb(26, 55, 107) 100%);
    color: var(--text-primary);
    border: 3px solid var(--border-primary);
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.05em;
    font-weight: 700;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

.nav-buttons button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.nav-buttons button:hover::before {
    width: 300px;
    height: 300px;
}

.nav-buttons button:hover {
    background: linear-gradient(135deg, rgb(100, 181, 246) 0%, rgb(54, 111, 199) 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(54, 111, 199, 0.6);
    border-color: var(--accent-light-blue);
}

.nav-buttons button:active {
    transform: translateY(-1px);
}

.print-btn {
    background: linear-gradient(135deg, rgb(46, 125, 50) 0%, rgb(27, 94, 32) 100%) !important;
    border-color: rgb(76, 175, 80) !important;
}

.print-btn:hover {
    background: linear-gradient(135deg, rgb(76, 175, 80) 0%, rgb(46, 125, 50) 100%) !important;
    box-shadow: 0 8px 25px rgba(46, 125, 50, 0.6) !important;
}

/* ==================== MAIN CONTENT ==================== */
main {
    background: rgba(18, 31, 61, 0.8);
    padding: 35px;
}

/* ==================== CONTENT SECTIONS ==================== */
.content-section {
    background: linear-gradient(135deg, rgba(26, 55, 107, 0.9) 0%, rgba(18, 31, 61, 0.9) 100%);
    padding: 35px;
    margin-bottom: 35px;
    border: 4px solid var(--border-primary);
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

.content-section:hover {
    box-shadow: 0 10px 30px rgba(54, 111, 199, 0.4);
}

.content-section h2 {
    color: var(--accent-gold);
    font-size: 2.2em;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 4px solid var(--border-primary);
    font-weight: 800;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.7);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ==================== SUBSECTIONS ==================== */
.subsection {
    margin-bottom: 30px;
    padding: 25px;
    background: rgba(18, 31, 61, 0.7);
    border-left: 6px solid var(--primary-blue);
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

.subsection h3 {
    color: var(--accent-light-blue);
    font-size: 1.6em;
    margin-bottom: 18px;
    font-weight: 800;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

.subsection p {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 15px;
    line-height: 1.8;
}

.subsection ul {
    list-style-type: none;
    padding-left: 0;
}

.subsection ul li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.7;
}

.subsection ul li::before {
    content: "▶";
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: 800;
    font-size: 1.1em;
}

.subsection ul li strong {
    color: var(--accent-gold);
    font-weight: 800;
}

/* ==================== TABLES ==================== */
.table-container {
    margin: 30px 0;
    overflow-x: auto;
    background: rgba(18, 31, 61, 0.7);
    padding: 25px;
    border-radius: 10px;
    border: 3px solid var(--border-primary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.table-container h3 {
    color: var(--accent-light-blue);
    margin-bottom: 20px;
    font-size: 1.5em;
    font-weight: 800;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: rgba(26, 55, 107, 0.8);
    border: 3px solid var(--border-primary);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
}

table thead {
    background: linear-gradient(135deg, rgb(54, 111, 199) 0%, rgb(26, 55, 107) 100%);
}

table thead th {
    padding: 18px;
    text-align: left;
    color: var(--text-primary);
    font-weight: 800;
    border-bottom: 3px solid var(--accent-gold);
    font-size: 1.1em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

table tbody td {
    padding: 15px 18px;
    border-bottom: 2px solid rgba(54, 111, 199, 0.3);
    color: var(--text-primary);
    font-weight: 700;
}

table tbody tr {
    transition: all 0.3s ease;
}

table tbody tr:nth-child(even) {
    background: rgba(18, 31, 61, 0.6);
}

table tbody tr:hover {
    background: rgba(54, 111, 199, 0.4);
    transform: scale(1.01);
    box-shadow: 0 2px 10px rgba(54, 111, 199, 0.5);
}

.total-row {
    background: linear-gradient(135deg, rgb(46, 125, 50) 0%, rgb(27, 94, 32) 100%) !important;
    font-weight: 800;
}

.total-row td {
    color: var(--text-primary) !important;
    font-weight: 800;
    border-top: 3px solid var(--accent-gold);
}

/* ==================== FLOWCHART ==================== */
.flowchart {
    margin: 30px 0;
    padding: 30px;
    background: rgba(18, 31, 61, 0.7);
    border: 4px solid var(--border-primary);
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
}

.flowchart h3 {
    color: var(--accent-light-blue);
    margin-bottom: 25px;
    text-align: center;
    font-size: 1.7em;
    font-weight: 800;
    text-transform: uppercase;
}

.flowchart-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.flow-box {
    padding: 18px 35px;
    border-radius: 10px;
    text-align: center;
    font-weight: 800;
    min-width: 320px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

.flow-box:hover {
    transform: scale(1.05);
}

.flow-box.start {
    background: linear-gradient(135deg, rgb(46, 125, 50) 0%, rgb(27, 94, 32) 100%);
    border: 4px solid rgb(76, 175, 80);
    color: var(--text-primary);
}

.flow-box.decision {
    background: linear-gradient(135deg, rgb(245, 124, 0) 0%, rgb(230, 81, 0) 100%);
    border: 4px solid var(--accent-gold);
    color: var(--text-primary);
}

.flow-box.end {
    background: linear-gradient(135deg, rgb(54, 111, 199) 0%, rgb(26, 55, 107) 100%);
    border: 4px solid var(--accent-light-blue);
    color: var(--text-primary);
}

.flow-arrow {
    font-size: 2.5em;
    color: var(--accent-gold);
    font-weight: 800;
    margin: 8px 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.flow-note {
    margin-top: 25px;
    padding: 18px;
    background: linear-gradient(135deg, rgb(198, 40, 40) 0%, rgb(183, 28, 28) 100%);
    border: 3px solid rgb(239, 83, 80);
    border-radius: 10px;
    color: var(--text-primary);
    font-weight: 800;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

/* ==================== EXAMPLE BOXES ==================== */
.example-box {
    margin: 30px 0;
    padding: 30px;
    background: linear-gradient(135deg, rgba(46, 125, 50, 0.3) 0%, rgba(27, 94, 32, 0.3) 100%);
    border: 4px solid rgb(76, 175, 80);
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
}

.example-box h3 {
    color: rgb(129, 199, 132);
    margin-bottom: 18px;
    font-size: 1.5em;
    font-weight: 800;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

.example-box p {
    margin-bottom: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.example-box strong {
    color: var(--accent-gold);
    font-weight: 800;
}

.example-box ul {
    list-style-type: none;
    padding-left: 25px;
}

.example-box ul li {
    padding: 10px 0;
    color: var(--text-primary);
    font-weight: 700;
    position: relative;
}

.example-box ul li::before {
    content: "✓";
    position: absolute;
    left: -25px;
    color: rgb(76, 175, 80);
    font-weight: 800;
    font-size: 1.2em;
}

/* ==================== CASE LAW BOXES ==================== */
.case-box {
    margin: 30px 0;
    padding: 30px;
    background: linear-gradient(135deg, rgba(121, 85, 72, 0.4) 0%, rgba(93, 64, 55, 0.4) 100%);
    border: 4px solid rgb(161, 136, 127);
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
}

.case-box h3 {
    color: rgb(188, 170, 164);
    margin-bottom: 18px;
    font-size: 1.5em;
    font-weight: 800;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
}

.case-box p {
    margin-bottom: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.case-box strong {
    color: var(--accent-gold);
    font-weight: 800;
}

.case-box ul {
    list-style-type: none;
    padding-left: 25px;
}

.case-box ul li {
    padding: 10px 0;
    color: var(--text-primary);
    font-weight: 700;
    position: relative;
}

.case-box ul li::before {
    content: "⚖";
    position: absolute;
    left: -25px;
    color: rgb(161, 136, 127);
    font-weight: 800;
    font-size: 1.2em;
}

/* ==================== Q&A SECTION ==================== */
.qa-container {
    margin-top: 25px;
}

.qa-item {
    margin-bottom: 18px;
    border: 3px solid var(--border-primary);
    border-radius: 10px;
    overflow: hidden;
    background: rgba(18, 31, 61, 0.7);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
}

.qa-item:hover {
    box-shadow: 0 6px 20px rgba(54, 111, 199, 0.5);
}

.qa-question {
    width: 100%;
    padding: 20px 25px;
    background: linear-gradient(135deg, rgb(54, 111, 199) 0%, rgb(26, 55, 107) 100%);
    border: none;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    font-size: 1.15em;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 18px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.qa-question:hover {
    background: linear-gradient(135deg, rgb(100, 181, 246) 0%, rgb(54, 111, 199) 100%);
}

.qa-icon {
    font-size: 1.7em;
    color: var(--accent-gold);
}

.qa-text {
    flex: 1;
    font-weight: 800;
}

.toggle-icon {
    font-size: 2em;
    font-weight: 800;
    color: var(--accent-gold);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.qa-question.active .toggle-icon {
    transform: rotate(45deg);
}

.qa-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(18, 31, 61, 0.9);
}

.qa-answer.show {
    max-height: 2500px;
    padding: 25px;
    border-top: 3px solid var(--accent-gold);
}

.qa-answer p {
    margin-bottom: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.qa-answer strong {
    color: var(--accent-gold);
    font-weight: 800;
}

.qa-answer ul {
    list-style-type: none;
    padding-left: 25px;
}

.qa-answer ul li {
    padding: 10px 0;
    color: var(--text-primary);
    font-weight: 700;
    position: relative;
}

.qa-answer ul li::before {
    content: "➤";
    position: absolute;
    left: -25px;
    color: var(--accent-light-blue);
    font-weight: 800;
    font-size: 1.1em;
}

/* ==================== FOOTER ==================== */
footer {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, rgb(26, 55, 107) 0%, rgb(18, 31, 61) 100%);
    border-top: 5px solid var(--accent-gold);
    color: var(--text-primary);
    font-weight: 700;
}

footer p {
    margin: 10px 0;
    font-weight: 700;
}

/* ==================== PRINT STYLES ==================== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .container {
        border: none;
        box-shadow: none;
    }
    
    .navigation,
    .print-btn {
        display: none;
    }
    
    .content-section {
        page-break-inside: avoid;
        border: 2px solid #000;
    }
    
    table {
        page-break-inside: avoid;
    }
    
    .qa-answer {
        max-height: none !important;
        display: block !important;
        padding: 20px !important;
    }
    
    .toggle-icon {
        display: none;
    }
    
    h1, h2, h3 {
        color: #000 !important;
        text-shadow: none !important;
    }
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 1024px) {
    .container {
        margin: 10px;
    }
    
    header h1 {
        font-size: 2.5em;
    }
    
    .content-section h2 {
        font-size: 1.9em;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
        letter-spacing: 1px;
    }
    
    .nav-buttons {
        grid-template-columns: 1fr;
    }
    
    .content-section {
        padding: 25px;
    }
    
    .content-section h2 {
        font-size: 1.6em;
    }
    
    .subsection h3 {
        font-size: 1.4em;
    }
    
    table {
        font-size: 0.9em;
    }
    
    .flow-box {
        min-width: 260px;
        font-size: 0.95em;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 5px;
        border-width: 2px;
    }
    
    header h1 {
        font-size: 1.6em;
    }
    
    .nav-buttons button {
        font-size: 0.95em;
        padding: 12px 18px;
    }
}

/* ==================== SELECTION COLOR ==================== */
::selection {
    background: var(--accent-gold);
    color: rgb(18, 31, 61);
}

::-moz-selection {
    background: var(--accent-gold);
    color: rgb(18, 31, 61);
}

/* ==================== SCROLLBAR STYLING ==================== */
::-webkit-scrollbar {
    width: 14px;
}

::-webkit-scrollbar-track {
    background: rgb(18, 31, 61);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, rgb(54, 111, 199) 0%, rgb(100, 181, 246) 100%);
    border-radius: 10px;
    border: 3px solid rgb(18, 31, 61);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, rgb(100, 181, 246) 0%, rgb(54, 111, 199) 100%);
}

/* ==================== ACTIVE NAV BUTTON ==================== */
.active-nav {
    background: linear-gradient(135deg, rgb(245, 124, 0) 0%, rgb(230, 81, 0) 100%) !important;
    border-color: var(--accent-gold) !important;
    box-shadow: 0 8px 25px rgba(245, 124, 0, 0.6) !important;
}

/* ==================== ACCESSIBILITY ==================== */
button:focus,
a:focus {
    outline: 3px solid var(--accent-gold);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-section {
    animation: fadeIn 0.6s ease-out;
}